Infinite loop and enormous memory consumption when building release

[khuey]

Check out https://github.com/khuey/cpp_demangle/tree/experimental.

cargo build works fine.
cargo build --release seems to go into an iloop and burn through memory (I gave it 10 minutes of CPU and 16GB of memory before I killed it).

The previous commit works fine, so something in khuey/cpp_demangle@df43ff0 is triggering it.

I see this on both stable and latest nightly.

rustc -V --verbose
rustc 1.25.0 (84203cac6 2018-03-25)
binary: rustc
commit-hash: 84203cac67e65ca8640b8392348411098c856985
commit-date: 2018-03-25
host: x86_64-unknown-linux-gnu
release: 1.25.0
LLVM version: 6.0

rustc -V --verbose
rustc 1.27.0-nightly (66363b288 2018-04-28)
binary: rustc
commit-hash: 66363b288141ed2af4b95fb4205a56dce6248363
commit-date: 2018-04-28
host: x86_64-unknown-linux-gnu
release: 1.27.0-nightly
LLVM version: 6.0

[ExpHP]

Possibly related to #49402

[fitzgen]

Looks like this is all in LLVM:

[fitzgen]

Output of RUSTFLAGS="-Z time-passes" cargo build --release until it hangs:

$ RUSTFLAGS="-Z time-passes" cargo build --release
   Compiling glob v0.2.11
   Compiling unicode-width v0.1.4
   Compiling libc v0.2.33
   Compiling strsim v0.7.0
   Compiling ansi_term v0.11.0
   Compiling vec_map v0.8.0
   Compiling bitflags v1.0.2
  time: 0.005	parsing
  time: 0.000	recursion limit
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	plugin registration
  time: 0.005	parsing
  time: 0.000	recursion limit
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	plugin registration
  time: 0.006	parsing
  time: 0.000	recursion limit
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	plugin registration
  time: 0.009	parsing
  time: 0.000	recursion limit
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	plugin registration
  time: 0.008	parsing
  time: 0.010	parsing
  time: 0.000	recursion limit
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	recursion limit
  time: 0.000	plugin registration
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	plugin registration
  time: 0.012	parsing
  time: 0.000	recursion limit
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	plugin registration
    time: 0.019	expand crate
    time: 0.023	expand crate
    time: 0.031	expand crate
    time: 0.030	expand crate
    time: 0.028	expand crate
    time: 0.000	check unused macros
    time: 0.000	check unused macros
    time: 0.000	check unused macros
    time: 0.000	check unused macros
    time: 0.000	check unused macros
  time: 0.032	expansion
  time: 0.036	expansion
  time: 0.030	expansion
  time: 0.032	expansion
  time: 0.000	maybe building test harness
  time: 0.000	maybe building test harness
  time: 0.037	expansion
  time: 0.000	maybe building test harness
  time: 0.000	maybe building test harness
  time: 0.000	maybe building test harness
  time: 0.000	maybe creating a macro crate
  time: 0.000	maybe creating a macro crate
  time: 0.000	maybe creating a macro crate
  time: 0.000	maybe creating a macro crate
  time: 0.000	maybe creating a macro crate
  time: 0.000	creating allocators
  time: 0.000	AST validation
  time: 0.000	creating allocators
  time: 0.001	creating allocators
  time: 0.001	creating allocators
  time: 0.001	creating allocators
  time: 0.000	AST validation
  time: 0.000	AST validation
  time: 0.002	name resolution
    time: 0.036	expand crate
    time: 0.000	check unused macros
  time: 0.094	expansion
  time: 0.000	maybe building test harness
  time: 0.000	maybe creating a macro crate
  time: 0.001	AST validation
  time: 0.001	name resolution
  time: 0.001	AST validation
  time: 0.001	complete gated feature checking
  time: 0.001	name resolution
  time: 0.001	creating allocators
  time: 0.001	complete gated feature checking
  time: 0.001	AST validation
  time: 0.002	lowering ast -> hir
  time: 0.001	lowering ast -> hir
  time: 0.000	early lint checks
  time: 0.003	complete gated feature checking
  time: 0.001	early lint checks
  time: 0.001	lowering ast -> hir
  time: 0.000	early lint checks
  time: 0.001	indexing hir
  time: 0.000	load query result cache
  time: 0.000	looking for entry point
  time: 0.000	looking for plugin registrar
  time: 0.000	loop checking
  time: 0.000	attribute checking
  time: 0.001	indexing hir
  time: 0.002	indexing hir
  time: 0.006	name resolution
  time: 0.007	name resolution
  time: 0.001	stability checking
  time: 0.008	name resolution
    time: 0.148	expand crate
    time: 0.000	check unused macros
  time: 0.170	expansion
  time: 0.000	maybe building test harness
  time: 0.000	load query result cache
  time: 0.000	looking for entry point
  time: 0.000	looking for plugin registrar
  time: 0.000	loop checking
  time: 0.001	maybe creating a macro crate
  time: 0.000	load query result cache
  time: 0.000	looking for entry point
  time: 0.000	looking for plugin registrar
  time: 0.000	attribute checking
  time: 0.000	loop checking
  time: 0.000	stability checking
  time: 0.000	type collecting
  time: 0.000	outlives testing
  time: 0.000	impl wf inference
  time: 0.000	coherence checking
  time: 0.000	variance testing
  time: 0.000	attribute checking
  time: 0.000	wf checking
  time: 0.000	item-types checking
  time: 0.000	item-bodies checking
  time: 0.000	rvalue promotion
  time: 0.004	type collecting
  time: 0.001	stability checking
  time: 0.003	creating allocators
  time: 0.007	complete gated feature checking
  time: 0.005	complete gated feature checking
  time: 0.005	complete gated feature checking
  time: 0.000	outlives testing
  time: 0.000	impl wf inference
  time: 0.000	privacy checking
  time: 0.000	intrinsic checking
  time: 0.000	match checking
  time: 0.000	liveness checking
  time: 0.000	borrow checking
  time: 0.000	MIR borrow checking
  time: 0.000	dumping chalk-like clauses
  time: 0.000	MIR effect checking
  time: 0.000	death checking
  time: 0.000	unused lib feature checking
  time: 0.002	AST validation
  time: 0.004	type collecting
  time: 0.002	lint checking
  time: 0.000	outlives testing
  time: 0.000	resolving dependency formats
  time: 0.000	impl wf inference
  time: 0.000	coherence checking
  time: 0.000	variance testing
  time: 0.005	lowering ast -> hir
  time: 0.001	early lint checks
  time: 0.003	wf checking
    time: 0.004	write metadata
    time: 0.000	translation item collection
  time: 0.009	lowering ast -> hir
  time: 0.008	lowering ast -> hir
  time: 0.002	indexing hir
  time: 0.009	name resolution
  time: 0.032	coherence checking
  time: 0.009	item-types checking
  time: 0.000	variance testing
    time: 0.000	codegen unit partitioning
  time: 0.000	load query result cache
  time: 0.000	looking for entry point
  time: 0.000	looking for plugin registrar
  time: 0.000	loop checking
  time: 0.003	early lint checks
  time: 0.001	attribute checking
  time: 0.004	early lint checks
  time: 0.004	wf checking
  time: 0.002	stability checking
  time: 0.005	complete gated feature checking
  time: 0.002	item-types checking
    time: 0.001	translate to LLVM IR
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 0.069	translation
    time: 0.000	llvm function passes [bitflags0]
    time: 0.000	llvm module passes [bitflags0]
  time: 0.005	indexing hir
  time: 0.000	load query result cache
  time: 0.000	looking for entry point
  time: 0.0  time: 0.006	indexing hir
00	looking for plugin registrar
  time: 0.006	type collecting
    time: 0.000	LTO passes
  time: 0.009	lowering ast -> hir
  time: 0.022	item-bodies checking
  time: 0.000	outlives testing
  time: 0.000	impl wf inference
  time: 0.000	load query result cache
  time: 0.000	looking for entry point
  time: 0.000	looking for plugin registrar
  time: 0.000	loop checking
    time: 0.001	codegen passes [bitflags0-8420e741fe7b4ea5c3c472400c2278e8.rs]
  time: 0.033	LLVM passes
  time: 0.000	serialize work products
  time: 0.000	attribute checking
  time: 0.002	early lint checks
  time: 0.000	loop checking
  time: 0.003	rvalue promotion
  time: 0.000	attribute checking
  time: 0.001	privacy checking
  time: 0.000	intrinsic checking
  time: 0.000	match checking
  time: 0.000	liveness checking
  time: 0.001	stability checking
  time: 0.004	linking
  time: 0.006	type collecting
  time: 0.000	outlives testing
  time: 0.000	impl wf inference
  time: 0.010	indexing hir
  time: 0.000	load query result cache
  time: 0.019	stability checking
  time: 0.048	coherence checking
  time: 0.017	borrow checking
  time: 0.054	coherence checking
  time: 0.081	item-bodies checking
  time: 0.000	looking for entry point
  time: 0.000	MIR borrow checking
  time: 0.000	variance testing
  time: 0.000	variance testing
  time: 0.000	dumping chalk-like clauses
  time: 0.000	looking for plugin registrar
  time: 0.000	MIR effect checking
  time: 0.000	death checking
  time: 0.000	unused lib feature checking
  time: 0.001	loop checking
  time: 0.002	attribute checking
  time: 0.006	rvalue promotion
  time: 0.003	stability checking
  time: 0.001	privacy checking
  time: 0.000	intrinsic checking
  time: 0.008	type collecting
  time: 0.000	outlives testing
  time: 0.000	impl wf inference
  time: 0.001	match checking
  time: 0.001	liveness checking
  time: 0.013	wf checking
  time: 0.013	lint checking
  time: 0.000	resolving dependency formats
  time: 0.001	item-types checking
  time: 0.017	wf checking
    time: 0.009	write metadata
  time: 0.017	type collecting
  time: 0.007	item-types checking
  time: 0.044	coherence checking
  time: 0.021	borrow checking
  time: 0.000	variance testing
  time: 0.000	MIR borrow checking
  time: 0.000	dumping chalk-like clauses
  time: 0.000	MIR effect checking
    time: 0.000	translation item collection
    time: 0.000	codegen unit partitioning
  time: 0.000	death checking
  time: 0.000	unused lib feature checking
  time: 0.000	outlives testing
  time: 0.000	impl wf inference
    time: 0.000	translate to LLVM IR
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 0.059	translation
  time: 0.002	lint checking
  time: 0.000	resolving dependency formats
    time: 0.000	llvm function passes [unicode_width0]
    time: 0.001	write metadata
    time: 0.000	llvm module passes [unicode_width0]
    time: 0.000	LTO passes
    time: 0.001	codegen passes [unicode_width0-1b3ca03cd0a4a064ce2ae2b97507cd1.rs]
  time: 0.006	LLVM passes
  time: 0.000	serialize work products
  time: 0.010	wf checking
  time: 0.079	item-bodies checking
  time: 0.037	coherence checking
  time: 0.045	item-bodies checking
  time: 0.002	linking
    time: 0.063	translation item collection
  time: 0.000	variance testing
  time: 0.004	item-types checking
   Compiling textwrap v0.9.0
  time: 0.010	rvalue promotion
  time: 0.011	rvalue promotion
    time: 0.005	codegen unit partitioning
  time: 0.005	privacy checking
  time: 0.000	intrinsic checking
  time: 0.001	match checking
  time: 0.000	liveness checking
  time: 0.005	privacy checking
  time: 0.000	intrinsic checking
  time: 0.002	match checking
  time: 0.001	liveness checking
  time: 0.042	wf checking
  time: 0.038	borrow checking
  time: 0.000	MIR borrow checking
  time: 0.000	dumping chalk-like clauses
  time: 0.000	MIR effect checking
  time: 0.000	death checking
  time: 0.000	unused lib feature checking
  time: 0.008	parsing
  time: 0.000	recursion limit
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	plugin registration
  time: 0.015	lint checking
  time: 0.000	resolving dependency formats
    time: 0.017	write metadata
    time: 0.000	translation item collection
    time: 0.000	codegen unit partitioning
    time: 0.000	translate to LLVM IR
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 0.020	translation
    time: 0.028	llvm function passes [strsim0]
    time: 0.036	expand crate
    time: 0.000	check unused macros
  time: 0.036	expansion
  time: 0.000	maybe building test harness
  time: 0.000	maybe creating a macro crate
  time: 0.001	creating allocators
    time: 0.000	llvm function passes [vec_map0]
    time: 0.000	llvm module passes [vec_map0]
  time: 0.000	AST validation
    time: 0.000	LTO passes
  time: 0.079	borrow checking
    time: 0.001	codegen passes [vec_map0-bc87066aacb77692a3e4c6fa60706cf9.rs]
  time: 0.000	MIR borrow checking
  time: 0.007	LLVM passes
  time: 0.000	dumping chalk-like clauses
  time: 0.004	name resolution
  time: 0.000	MIR effect checking
  time: 0.000	serialize work products
  time: 0.001	death checking
  time: 0.005	complete gated feature checking
    time: 0.014	llvm function passes [strsim3]
  time: 0.071	item-types checking
  time: 0.000	unused lib feature checking
  time: 0.131	item-bodies checking
  time: 0.002	linking
  time: 0.004	lowering ast -> hir
  time: 0.001	early lint checks
  time: 0.002	indexing hir
  time: 0.000	load query result cache
  time: 0.000	looking for entry point
  time: 0.000	looking for plugin registrar
  time: 0.000	loop checking
  time: 0.000	attribute checking
  time: 0.001	stability checking
  time: 0.009	lint checking
  time: 0.000	resolving dependency formats
  time: 0.005	type collecting
  time: 0.000	outlives testing
  time: 0.000	impl wf inference
  time: 0.019	rvalue promotion
  time: 0.006	privacy checking
    time: 0.022	write metadata
  time: 0.000	intrinsic checking
  time: 0.003	match checking
  time: 0.001	liveness checking
    time: 0.016	llvm function passes [strsim2]
  time: 0.047	item-bodies checking
    time: 0.022	translation item collection
  time: 0.043	coherence checking
  time: 0.000	variance testing
    time: 0.008	llvm function passes [strsim4]
  time: 0.010	rvalue promotion
    time: 0.001	codegen unit partitioning
  time: 0.006	wf checking
  time: 0.002	item-types checking
  time: 0.022	privacy checking
  time: 0.001	intrinsic checking
  time: 0.003	match checking
  time: 0.001	liveness checking
  time: 0.088	borrow checking
  time: 0.000	MIR borrow checking
  time: 0.000	dumping chalk-like clauses
  time: 0.000	MIR effect checking
  time: 0.001	death checking
  time: 0.000	unused lib feature checking
  time: 0.010	lint checking
  time: 0.000	resolving dependency formats
    time: 0.015	write metadata
    time: 0.155	llvm module passes [strsim3]
    time: 0.016	llvm function passes [ansi_term8]
  time: 0.088	item-bodies checking
  time: 0.078	borrow checking
    time: 0.016	llvm function passes [strsim1]
  time: 0.001	MIR borrow checking
  time: 0.000	dumping chalk-like clauses
    time: 0.141	llvm module passes [strsim2]
  time: 0.001	MIR effect checking
  time: 0.004	death checking
  time: 0.000	unused lib feature checking
    time: 0.007	llvm function passes [strsim7]
  time: 0.024	rvalue promotion
  time: 0.002	privacy checking
  time: 0.000	intrinsic checking
  time: 0.001	match checking
  time: 0.000	liveness checking
    time: 0.138	llvm module passes [strsim4]
    time: 0.020	llvm module passes [strsim7]
    time: 0.004	llvm function passes [strsim13]
    time: 0.269	llvm module passes [strsim0]
    time: 0.003	llvm function passes [strsim5]
  time: 0.043	borrow checking
  time: 0.000	MIR borrow checking
  time: 0.000	dumping chalk-like clauses
  time: 0.000	MIR effect checking
  time: 0.000	death checking
  time: 0.000	unused lib feature checking
    time: 0.002	llvm function passes [strsim6]
  time: 0.005	lint checking
  time: 0.000	resolving dependency formats
    time: 0.009	llvm module passes [strsim6]
    time: 0.017	llvm module passes [strsim5]
    time: 0.007	write metadata
    time: 0.205	translate to LLVM IR
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 0.457	translation
    time: 0.006	llvm function passes [strsim8]
    time: 0.004	llvm function passes [strsim9]
    time: 0.087	llvm module passes [strsim1]
    time: 0.113	llvm module passes [ansi_term8]
    time: 0.004	llvm function passes [strsim10]
    time: 0.013	llvm module passes [strsim9]
    time: 0.127	translation item collection
    time: 0.005	llvm function passes [ansi_term3]
    time: 0.021	llvm module passes [strsim8]
    time: 0.063	llvm module passes [strsim13]
    time: 0.009	llvm module passes [strsim10]
    time: 0.002	llvm function passes [strsim11]
    time: 0.002	llvm function passes [strsim14]
    time: 0.002	llvm function passes [strsim15]
    time: 0.004	llvm module passes [strsim11]
  time: 0.107	lint checking
  time: 0.000	resolving dependency formats
    time: 0.001	llvm function passes [strsim12]
    time: 0.007	llvm module passes [strsim14]
    time: 0.008	llvm module passes [strsim15]
    time: 0.004	llvm module passes [strsim12]
    time: 0.005	llvm function passes [ansi_term10]
    time: 0.008	llvm function passes [ansi_term4]
    time: 0.008	codegen unit partitioning
    time: 0.003	llvm function passes [ansi_term9]
    time: 0.008	llvm module passes [ansi_term10]
    time: 0.001	llvm function passes [ansi_term11]
    time: 0.007	llvm module passes [ansi_term9]
    time: 0.091	translation item collection
    time: 0.058	write metadata
    time: 0.002	llvm module passes [ansi_term11]
    time: 0.046	llvm module passes [ansi_term3]
    time: 0.036	llvm module passes [ansi_term4]
    time: 0.001	llvm function passes [ansi_term5]
    time: 0.003	translation item collection
    time: 0.001	llvm function passes [ansi_term2]
    time: 0.001	llvm function passes [ansi_term12]
    time: 0.001	codegen unit partitioning
    time: 0.002	llvm module passes [ansi_term5]
    time: 0.002	llvm module passes [ansi_term12]
    time: 0.003	llvm module passes [ansi_term2]
    time: 0.073	translate to LLVM IR
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 0.349	translation
    time: 0.001	llvm function passes [ansi_term1]
    time: 0.001	llvm function passes [ansi_term7]
    time: 0.001	llvm module passes [ansi_term1]
    time: 0.001	llvm function passes [ansi_term0]
    time: 0.001	llvm module passes [ansi_term7]
    time: 0.001	llvm module passes [ansi_term0]
    time: 0.003	codegen unit partitioning
    time: 0.035	LTO passes
    time: 0.017	translate to LLVM IR
    time: 0.001	llvm function passes [ansi_term6]
    time: 0.007	llvm function passes [libc3]
    time: 0.003	llvm function passes [libc2]
    time: 0.001	llvm module passes [ansi_term6]
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 0.130	translation
    time: 0.010	llvm module passes [libc2]
    time: 0.002	llvm function passes [libc1]
    time: 0.022	llvm module passes [libc3]
    time: 0.009	llvm module passes [libc1]
    time: 0.001	llvm function passes [libc0]
    time: 0.002	llvm module passes [libc0]
    time: 0.015	LTO passes
    time: 0.062	codegen passes [strsim2-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.028	codegen passes [libc3-940b5f195a61e9a8d38460bb1b3238a.rs]
    time: 0.010	LTO passes
    time: 0.093	LTO passes
    time: 0.077	llvm function passes [glob0]
    time: 0.013	codegen passes [libc2-940b5f195a61e9a8d38460bb1b3238a.rs]
    time: 0.006	LTO passes
    time: 0.089	LTO passes
    time: 0.009	codegen passes [libc1-940b5f195a61e9a8d38460bb1b3238a.rs]
    time: 0.002	LTO passes
    time: 0.003	codegen passes [libc0-940b5f195a61e9a8d38460bb1b3238a.rs]
  time: 0.201	LLVM passes
  time: 0.000	serialize work products
  time: 0.011	linking
    time: 0.089	LTO passes
    time: 0.026	llvm function passes [glob2]
    time: 0.238	LTO passes
    time: 0.085	codegen passes [strsim3-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.034	llvm function passes [textwrap0]
    time: 0.040	codegen passes [strsim4-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.088	codegen passes [ansi_term8-531b01d1a0614b39f74fe93016e81854.rs]
    time: 0.012	llvm function passes [textwrap1]
    time: 0.010	LTO passes
    time: 0.011	codegen passes [strsim6-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.047	LTO passes
    time: 0.033	LTO passes
    time: 0.017	LTO passes
    time: 0.062	llvm module passes [textwrap1]
    time: 0.017	codegen passes [ansi_term3-531b01d1a0614b39f74fe93016e81854.rs]
    time: 0.029	codegen passes [strsim1-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.018	codegen passes [strsim13-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.012	LTO passes
    time: 0.015	llvm function passes [textwrap14]
    time: 0.008	LTO passes
    time: 0.024	LTO passes
    time: 0.014	codegen passes [strsim5-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.009	codegen passes [strsim8-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.005	LTO passes
    time: 0.009	LTO passes
    time: 0.021	codegen passes [ansi_term4-531b01d1a0614b39f74fe93016e81854.rs]
    time: 0.006	codegen passes [strsim10-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.004	LTO passes
    time: 0.012	codegen passes [strsim7-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.005	codegen passes [strsim9-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.006	LTO passes
    time: 0.015	LTO passes
    time: 0.002	LTO passes
    time: 0.006	codegen passes [strsim11-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.003	codegen passes [strsim12-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.012	codegen passes [ansi_term10-531b01d1a0614b39f74fe93016e81854.rs]
    time: 0.011	LTO passes
    time: 0.007	LTO passes
    time: 0.010	LTO passes
    time: 0.007	codegen passes [strsim15-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.211	llvm module passes [glob2]
    time: 0.004	codegen passes [strsim14-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.002	LTO passes
    time: 0.010	codegen passes [ansi_term9-531b01d1a0614b39f74fe93016e81854.rs]
    time: 0.004	codegen passes [ansi_term11-531b01d1a0614b39f74fe93016e81854.rs]
    time: 0.002	LTO passes
    time: 0.004	codegen passes [ansi_term5-531b01d1a0614b39f74fe93016e81854.rs]
    time: 0.004	LTO passes
    time: 0.003	codegen passes [ansi_term2-531b01d1a0614b39f74fe93016e81854.rs]
    time: 0.020	llvm function passes [glob1]
    time: 0.013	llvm function passes [glob3]
    time: 0.001	LTO passes
    time: 0.114	llvm module passes [textwrap14]
    time: 0.002	codegen passes [ansi_term1-531b01d1a0614b39f74fe93016e81854.rs]
    time: 0.226	codegen passes [strsim0-dc18c8a110791d8eacf7c20ed2346bba.rs]
    time: 0.002	LTO passes
    time: 0.002	codegen passes [ansi_term12-531b01d1a0614b39f74fe93016e81854.rs]
  time: 0.931	LLVM passes
  time: 0.000	serialize work products
    time: 0.001	LTO passes
    time: 0.012	llvm function passes [textwrap5]
    time: 0.001	LTO passes
    time: 0.002	codegen passes [ansi_term0-531b01d1a0614b39f74fe93016e81854.rs]
    time: 0.002	codegen passes [ansi_term7-531b01d1a0614b39f74fe93016e81854.rs]
  time: 0.014	linking
    time: 0.001	LTO passes
    time: 0.002	codegen passes [ansi_term6-531b01d1a0614b39f74fe93016e81854.rs]
   Compiling atty v0.2.3
  time: 0.762	LLVM passes
  time: 0.000	serialize work products
    time: 0.008	llvm function passes [textwrap2]
  time: 0.016	linking
  time: 0.005	parsing
  time: 0.000	recursion limit
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	plugin registration
    time: 0.093	llvm module passes [glob3]
    time: 0.008	llvm function passes [glob4]
    time: 0.008	llvm function passes [glob6]
    time: 0.122	llvm module passes [glob1]
    time: 0.031	expand crate
    time: 0.000	check unused macros
  time: 0.031	expansion
    time: 0.053	llvm module passes [textwrap2]
  time: 0.000	maybe building test harness
  time: 0.000	maybe creating a macro crate
  time: 0.000	creating allocators
  time: 0.000	AST validation
  time: 0.005	name resolution
  time: 0.000	complete gated feature checking
  time: 0.000	lowering ast -> hir
  time: 0.000	early lint checks
  time: 0.000	indexing hir
  time: 0.000	load query result cache
  time: 0.000	looking for entry p    time: 0.003	llvm function passes [textwrap4]
    time: 0.005	llvm function passes [glob15]
oint
  time: 0.000	looking for plugin registrar
  time: 0.000	loop checking
  time: 0.000	attribute checking
  time: 0.000	stability checking
  time: 0.002	type collecting
  time: 0.000	outlives testing
  time: 0.000	impl wf inference
    time: 0.034	llvm module passes [glob4]
    time: 0.116	llvm module passes [textwrap5]
    time: 0.012	llvm module passes [textwrap4]
    time: 0.005	llvm function passes [glob9]
    time: 0.005	llvm function passes [textwrap13]
    time: 0.038	llvm module passes [glob6]
    time: 0.005	llvm function passes [textwrap6]
    time: 0.030	llvm module passes [glob15]
    time: 0.005	llvm function passes [glob5]
    time: 0.379	llvm module passes [textwrap0]
    time: 0.002	llvm function passes [textwrap10]
    time: 0.019	llvm module passes [textwrap6]
    time: 0.007	llvm module passes [textwrap10]
    time: 0.005	llvm function passes [glob7]
    time: 0.038	llvm module passes [textwrap13]
    time: 0.004	llvm function passes [textwrap3]
    time: 0.001	llvm function passes [textwrap9]
    time: 0.002	llvm module passes [textwrap9]
    time: 0.039	llvm module passes [glob9]
  time: 0.052	coherence checking
    time: 0.228	translate to LLVM IR
    time: 0.011	llvm module passes [glob7]
  time: 0.000	variance testing
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 0.809	translation
    time: 0.027	llvm module passes [glob5]
    time: 0.307	translate to LLVM IR
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 0.923	translation
  time: 0.001	wf checking
  time: 0.000	item-types checking
    time: 0.002	llvm function passes [textwrap8]
    time: 0.011	llvm module passes [textwrap3]
    time: 0.004	llvm function passes [glob13]
    time: 0.003	llvm function passes [glob8]
    time: 0.004	llvm module passes [textwrap8]
    time: 0.002	llvm function passes [textwrap15]
    time: 0.003	llvm function passes [textwrap7]
  time: 0.012	item-bodies    time: 0.003	llvm function passes [glob14]
    time: 0.002	llvm function passes [textwrap11]
 checking
    time: 0.013	llvm module passes [glob8]
    time: 0.009	llvm module passes [textwrap15]
    time: 0.015	llvm module passes [glob13]
    time: 0.005	llvm module passes [textwrap7]
  time: 0.002	rvalue promotion
  time: 0.000	privacy checking
  time: 0.000	intrinsic checking
  time: 0.000	match checking
  time: 0.000	liveness checking
    time: 0.001	llvm function passes [textwrap12]
    time: 0.002	llvm function passes [glob10]
    time: 0.003	llvm function passes [glob11]
    time: 0.002	llvm module passes [textwrap12]
  time: 0.003	borrow checking
  time: 0.000	MIR borrow checking
  time: 0.000	dumping chalk-like clauses
  time: 0.000	MIR effect checking
  time: 0.000	death checking
  time: 0.000	unused lib feature checking
    time: 0.006	llvm module passes [textwrap11]
  time: 0.001	lint checking
  time: 0.000	resolving dependency formats
    time: 0.001	write metadata
    time: 0.009	llvm module passes [glob14]
    time: 0.019	translation item collection
    time: 0.002	llvm function passes [glob12]
    time: 0.019	LTO passes
    time: 0.006	llvm module passes [glob10]
    time: 0.010	llvm module passes [glob11]
    time: 0.657	llvm module passes [glob0]
    time: 0.000	codegen unit partitioning
    time: 0.008	llvm module passes [glob12]
    time: 0.023	LTO passes
    time: 0.027	codegen passes [textwrap1-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.021	translate to LLVM IR
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 0.092	translation
    time: 0.025	LTO passes
    time: 0.002	llvm function passes [atty0]
    time: 0.005	llvm module passes [atty0]
    time: 0.005	LTO passes
    time: 0.032	LTO passes
    time: 0.006	codegen passes [textwrap7-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.018	codegen passes [textwrap13-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.003	LTO passes
    time: 0.022	codegen passes [textwrap14-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.007	codegen passes [atty0-420f40453d37c2388cd2794639fff6d7.rs]
    time: 0.009	LTO passes
    time: 0.007	LTO passes
    time: 0.049	LTO passes
    time: 0.018	codegen passes [textwrap2-6d44f157bc1d1b91366175305c8fcc2.rs]
  time: 0.048	LLVM passes
    time: 0.004	LTO passes
    time: 0.002	LTO passes
    time: 0.002	codegen passes [textwrap8-6d44f157bc1d1b91366175305c8fcc2.rs]
  time: 0.000	serialize work products
    time: 0.008	codegen passes [textwrap6-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.009	codegen passes [textwrap3-6d44f157bc1d1b91366175305c8fcc2.rs]
  time: 0.004	linking
    time: 0.010	codegen passes [textwrap4-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.002	LTO passes
    time: 0.003	codegen passes [textwrap9-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.009	LTO passes
    time: 0.007	LTO passes
    time: 0.005	codegen passes [textwrap10-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.029	codegen passes [textwrap5-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.002	LTO passes
    time: 0.005	LTO passes
    time: 0.017	LTO passes
    time: 0.005	codegen passes [textwrap11-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.002	codegen passes [textwrap12-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.152	LTO passes
    time: 0.004	codegen passes [textwrap15-6d44f157bc1d1b91366175305c8fcc2.rs]
    time: 0.059	LTO passes
    time: 0.031	LTO passes
    time: 0.036	codegen passes [glob9-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.011	LTO passes
    time: 0.021	LTO passes
    time: 0.027	codegen passes [glob5-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.094	LTO passes
    time: 0.012	codegen passes [glob14-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.008	LTO passes
    time: 0.049	codegen passes [glob1-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.013	LTO passes
    time: 0.029	codegen passes [glob4-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.009	codegen passes [glob15-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.006	LTO passes
    time: 0.006	LTO passes
    time: 0.019	codegen passes [glob6-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.008	codegen passes [glob10-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.020	LTO passes
    time: 0.088	LTO passes
    time: 0.008	codegen passes [glob8-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.006	LTO passes
    time: 0.010	codegen passes [glob7-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.007	LTO passes
    time: 0.006	codegen passes [glob11-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.007	LTO passes
    time: 0.006	codegen passes [glob13-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.003	codegen passes [glob12-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.079	codegen passes [glob2-414ad8a7ede9c29c1f10c9e441e8617f.rs]
    time: 0.146	codegen passes [textwrap0-6d44f157bc1d1b91366175305c8fcc2.rs]
  time: 0.903	LLVM passes
  time: 0.000	serialize work products
    time: 0.051	codegen passes [glob3-414ad8a7ede9c29c1f10c9e441e8617f.rs]
  time: 0.008	linking
   Compiling clap v2.31.2
    time: 0.315	LTO passes
  time: 0.110	parsing
  time: 0.000	recursion limit
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	plugin registration
    time: 0.137	expand crate
    time: 0.000	check unused macros
  time: 0.137	expansion
  time: 0.000	maybe building test harness
  time: 0.002	maybe creating a macro crate
  time: 0.010	creating allocators
  time: 0.006	AST validation
    time: 0.205	codegen passes [glob0-414ad8a7ede9c29c1f10c9e441e8617f.rs]
  time: 1.417	LLVM passes
  time: 0.000	serialize work products
  time: 0.061	name resolution
  time: 0.015	linking
   Compiling cpp_demangle v0.2.7 (file:///Users/fitzgen/src/cpp_demangle)
  time: 0.001	parsing
  time: 0.000	recursion limit
  time: 0.000	crate injection
  time: 0.000	plugin loading
  time: 0.000	plugin registration
  time: 0.054	complete gated feature checking
    time: 0.026	expand crate
    time: 0.000	check unused macros
  time: 0.026	expansion
  time: 0.000	maybe building test harness
  time: 0.000	maybe creating a macro crate
  time: 0.000	creating allocators
  time: 0.000	AST validation
  time: 0.003	name resolution
  time: 0.000	complete gated feature checking
  time: 0.002	lowering ast -> hir
  time: 0.000	early lint checks
  time: 0.001	indexing hir
  time: 0.000	load query result cache
  time: 0.000	looking for entry point
  time: 0.000	looking for plugin registrar
  time: 0.000	loop checking
  time: 0.000	attribute checking
  time: 0.000	stability checking
  time: 0.001	type collecting
  time: 0.000	outlives testing
  time: 0.000	impl wf inference
  time: 0.000	coherence checking
  time: 0.000	variance testing
  time: 0.002	wf checking
  time: 0.000	item-types checking
  time: 0.046	lowering ast -> hir
  time: 0.011	early lint checks
  time: 0.038	indexing hir
  time: 0.000	load query result cache
  time: 0.000	looking for entry point
  time: 0.000	looking for plugin registrar
  time: 0.006	loop checking
  time: 0.002	attribute checking
  time: 0.095	item-bodies checking
  time: 0.004	rvalue promotion
  time: 0.001	privacy checking
  time: 0.000	intrinsic checking
  time: 0.000	match checking
  time: 0.000	liveness checking
  time: 0.023	stability checking
  time: 0.029	borrow checking
  time: 0.000	MIR borrow checking
  time: 0.000	dumping chalk-like clauses
  time: 0.000	MIR effect checking
  time: 0.000	death checking
  time: 0.000	unused lib feature checking
  time: 0.001	lint checking
  time: 0.000	resolving dependency formats
    time: 0.000	write metadata
  time: 0.025	type collecting
  time: 0.000	outlives testing
  time: 0.001	impl wf inference
  time: 0.044	coherence checking
  time: 0.000	variance testing
    time: 0.092	translation item collection
    time: 0.003	codegen unit partitioning
    time: 0.000	write allocator module
  time: 0.073	wf checking
  time: 0.016	item-types checking
    time: 0.017	llvm function passes [build_script_build2]
    time: 0.010	llvm function passes [build_script_build15]
    time: 0.010	llvm function passes [build_script_build1]
    time: 0.021	llvm function passes [build_script_build0]
    time: 0.007	llvm function passes [build_script_build4]
    time: 0.010	llvm function passes [build_script_build3]
    time: 0.126	llvm module passes [build_script_build1]
    time: 0.059	llvm module passes [build_script_build3]
    time: 0.007	llvm function passes [build_script_build9]
    time: 0.084	llvm module passes [build_script_build4]
    time: 0.008	llvm function passes [build_script_build5]
    time: 0.006	llvm function passes [build_script_build8]
    time: 0.005	llvm function passes [build_script_build14]
    time: 0.174	llvm module passes [build_script_build15]
    time: 0.004	llvm function passes [build_script_build6]
    time: 0.028	llvm module passes [build_script_build14]
    time: 0.045	llvm module passes [build_script_build8]
    time: 0.238	translate to LLVM IR
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 0.372	translation
    time: 0.003	llvm function passes [build_script_build13]
    time: 0.006	llvm function passes [build_script_build11]
    time: 0.007	llvm module passes [build_script_build13]
    time: 0.028	llvm module passes [build_script_build6]
    time: 0.067	llvm module passes [build_script_build5]
    time: 0.004	llvm function passes [build_script_build12]
    time: 0.003	llvm function passes [build_script_build7]
    time: 0.003	llvm function passes [build_script_build10]
    time: 0.005	llvm module passes [build_script_build10]
    time: 0.013	llvm module passes [build_script_build12]
    time: 0.026	llvm module passes [build_script_build11]
    time: 0.088	llvm module passes [build_script_build9]
    time: 0.014	llvm module passes [build_script_build7]
    time: 0.310	llvm module passes [build_script_build0]
  time: 1.327	item-bodies checking
  time: 0.152	rvalue promotion
  time: 0.045	privacy checking
  time: 0.002	intrinsic checking
  time: 0.014	match checking
  time: 0.011	liveness checking
  time: 0.849	borrow checking
  time: 0.001	MIR borrow checking
  time: 0.000	dumping chalk-like clauses
  time: 0.000	MIR effect checking
  time: 0.013	death checking
  time: 0.000	unused lib feature checking
  time: 0.088	lint checking
  time: 0.000	resolving dependency formats
    time: 0.109	write metadata
    time: 0.523	translation item collection
    time: 0.029	codegen unit partitioning
    time: 0.149	llvm function passes [clap1]
    time: 0.111	llvm function passes [clap0]
    time: 0.129	llvm function passes [clap10]
    time: 0.111	llvm function passes [clap7]
    time: 0.130	llvm function passes [clap11]
    time: 0.108	llvm function passes [clap15]
    time: 1.267	llvm module passes [clap7]
    time: 0.122	llvm function passes [clap9]
    time: 1.009	llvm module passes [clap15]
    time: 1.847	llvm module passes [clap0]
    time: 0.124	llvm function passes [clap5]
    time: 0.105	llvm function passes [clap2]
    time: 1.448	llvm module passes [clap11]
    time: 0.092	llvm function passes [clap12]
    time: 0.068	llvm function passes [clap4]
    time: 2.366	llvm module passes [clap10]
    time: 0.078	llvm function passes [clap8]
    time: 0.614	llvm module passes [clap4]
    time: 2.896	translate to LLVM IR
    time: 0.000	assert dep graph
    time: 0.000	serialize dep graph
  time: 4.268	translation
    time: 0.074	llvm function passes [clap13]
    time: 0.996	llvm module passes [clap12]
    time: 1.228	llvm module passes [clap5]
    time: 0.047	llvm function passes [clap6]
    time: 0.093	llvm function passes [clap3]
    time: 3.459	llvm module passes [clap1]
    time: 0.018	llvm function passes [clap14]
    time: 0.109	llvm module passes [clap14]
    time: 0.859	llvm module passes [clap8]
    time: 0.366	llvm module passes [clap6]
    time: 0.628	llvm module passes [clap13]
    time: 0.451	llvm module passes [clap3]
    time: 1.997	llvm module passes [clap9]
    time: 2.243	llvm module passes [clap2]
    time: 0.887	LTO passes
    time: 0.899	LTO passes
    time: 0.968	LTO passes
    time: 1.028	LTO passes
    time: 1.043	LTO passes
    time: 1.073	LTO passes
    time: 0.753	codegen passes [clap5-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.775	codegen passes [clap15-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.769	codegen passes [clap7-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.814	codegen passes [clap9-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.927	codegen passes [clap0-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.941	codegen passes [clap11-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.577	LTO passes
    time: 2.490	LTO passes
    time: 0.590	LTO passes
    time: 0.542	codegen passes [clap4-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 1.005	LTO passes
    time: 1.057	LTO passes
    time: 0.452	codegen passes [clap13-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.306	LTO passes
    time: 0.216	codegen passes [clap3-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 1.820	LTO passes
    time: 0.101	LTO passes
    time: 0.530	LTO passes
    time: 0.664	codegen passes [clap8-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.128	codegen passes [clap14-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.747	codegen passes [clap12-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 2.345	LTO passes
    time: 0.377	codegen passes [clap6-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 1.667	codegen passes [clap1-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.721	codegen passes [clap10-dba1da3c13add25e76b64c6f99c22cbb.rs]
    time: 0.592	codegen passes [clap2-dba1da3c13add25e76b64c6f99c22cbb.rs]
  time: 10.279	LLVM passes
  time: 0.000	serialize work products
  time: 0.052	linking
C-c

Last line printed is about linking, so maybe this is getting stuck in LTO?

[ExpHP]

Here's a self-contained test case that just barely hits the sweet spot where it starts to grow out of hand:

fn main() {
    use ::std::collections::HashSet;
    let set: HashSet<_> = {
        (0..86).into_iter()
            .chain(87..89)
            .chain(92..93)
            .chain(94..105)
//            .chain(107..108)
            .chain(116..118)
            .chain(122..124)
            .chain(128..131)
            .chain(133..134)
//            .chain(141..143)
            .chain(151..152)
            .chain(153..154)
//            .chain(158..168)
//            .chain(169..170)
//            .chain(179..180)
//            .chain(181..182)
//            .chain(185..186)
            .chain(188..189)
            .chain(201..202)
//            .chain(203..204)
            .collect()
    };
    assert!(set.contains(&153));
}

I do observe that "linking" is the last thing printed... but not quite in the same sense as @fitzgen: 😛

    ...
    time: 51.579; rss: 174MB    codegen passes [whee1-faa1bfdce812aee96e5ffecf666ddd72.rs]
  time: 61.759; rss: 154MB      LLVM passes
  time: 0.000; rss: 151MB       serialize work products
    time: 0.250; rss: 150MB     running linker
  time: 0.250; rss: 150MB       linking
    Finished release [optimized] target(s) in 62.30 secs
$

cargo +nightly rustc --release -- -Ztime-passes (62.3s)

$ cargo +nightly rustc --release -- -Ztime-passes
   Compiling whee v0.1.0 (file:///home/lampam/asd/clone/cpp_demangle/whee)
  time: 0.000; rss: 46MB        parsing
  time: 0.000; rss: 46MB        recursion limit
  time: 0.000; rss: 46MB        crate injection
  time: 0.000; rss: 46MB        plugin loading
  time: 0.000; rss: 46MB        plugin registration
    time: 0.020; rss: 71MB      expand crate
    time: 0.000; rss: 71MB      check unused macros
  time: 0.020; rss: 71MB        expansion
  time: 0.000; rss: 71MB        maybe building test harness
  time: 0.000; rss: 71MB        maybe creating a macro crate
  time: 0.000; rss: 71MB        creating allocators
  time: 0.000; rss: 71MB        AST validation
  time: 0.002; rss: 72MB        name resolution
  time: 0.000; rss: 72MB        complete gated feature checking
  time: 0.001; rss: 73MB        lowering ast -> hir
  time: 0.000; rss: 73MB        early lint checks
  time: 0.000; rss: 73MB        indexing hir
  time: 0.000; rss: 73MB        load query result cache
  time: 0.000; rss: 73MB        looking for entry point
  time: 0.000; rss: 73MB        looking for plugin registrar
  time: 0.000; rss: 73MB        loop checking
  time: 0.000; rss: 76MB        attribute checking
  time: 0.000; rss: 76MB        stability checking
  time: 0.000; rss: 76MB        type collecting
  time: 0.000; rss: 76MB        outlives testing
  time: 0.000; rss: 76MB        impl wf inference
  time: 0.000; rss: 76MB        coherence checking
  time: 0.000; rss: 76MB        variance testing
  time: 0.000; rss: 80MB        wf checking
  time: 0.000; rss: 80MB        item-types checking
  time: 0.048; rss: 120MB       item-bodies checking
  time: 0.003; rss: 121MB       rvalue promotion
  time: 0.000; rss: 121MB       privacy checking
  time: 0.000; rss: 121MB       intrinsic checking
  time: 0.000; rss: 122MB       match checking
  time: 0.000; rss: 122MB       liveness checking
  time: 0.005; rss: 123MB       borrow checking
  time: 0.000; rss: 123MB       MIR borrow checking
  time: 0.000; rss: 123MB       dumping chalk-like clauses
  time: 0.000; rss: 123MB       MIR effect checking
  time: 0.000; rss: 123MB       death checking
  time: 0.000; rss: 123MB       unused lib feature checking
  time: 0.000; rss: 123MB       lint checking
  time: 0.000; rss: 123MB       resolving dependency formats
    time: 0.000; rss: 123MB     write metadata
    time: 0.056; rss: 133MB     translation item collection
    time: 0.001; rss: 133MB     codegen unit partitioning
    time: 0.000; rss: 134MB     write allocator module
    time: 0.015; rss: 142MB     llvm function passes [whee1]
    time: 0.003; rss: 146MB     llvm function passes [whee13]
    time: 0.017; rss: 146MB     llvm function passes [whee0]
    time: 0.004; rss: 148MB     llvm function passes [whee4]
    time: 0.022; rss: 149MB     llvm module passes [whee4]
    time: 0.007; rss: 149MB     llvm function passes [whee3]
    time: 0.021; rss: 150MB     llvm module passes [whee3]
    time: 0.092; rss: 150MB     llvm module passes [whee13]
    time: 0.007; rss: 150MB     llvm function passes [whee5]
    time: 0.002; rss: 150MB     llvm function passes [whee2]
    time: 0.011; rss: 150MB     llvm module passes [whee2]
    time: 0.002; rss: 151MB     llvm function passes [whee7]
    time: 0.006; rss: 151MB     llvm module passes [whee7]
    time: 0.002; rss: 152MB     llvm function passes [whee9]
    time: 0.011; rss: 152MB     llvm module passes [whee9]
    time: 0.002; rss: 152MB     llvm function passes [whee11]
    time: 0.056; rss: 152MB     llvm module passes [whee5]
    time: 0.008; rss: 152MB     llvm module passes [whee11]
    time: 0.001; rss: 152MB     llvm function passes [whee10]
    time: 0.002; rss: 153MB     llvm function passes [whee6]
    time: 0.004; rss: 153MB     llvm module passes [whee10]
    time: 0.007; rss: 153MB     llvm module passes [whee6]
    time: 0.002; rss: 154MB     llvm function passes [whee8]
    time: 0.003; rss: 154MB     llvm module passes [whee8]
    time: 0.001; rss: 154MB     llvm function passes [whee12]
    time: 0.090; rss: 154MB     translate to LLVM IR
    time: 0.000; rss: 154MB     assert dep graph
    time: 0.000; rss: 154MB     serialize dep graph
  time: 0.288; rss: 154MB       translation
    time: 0.002; rss: 153MB     llvm module passes [whee12]
    time: 0.001; rss: 151MB     llvm function passes [whee14]
    time: 0.001; rss: 152MB     llvm module passes [whee14]
    time: 0.001; rss: 152MB     llvm function passes [whee15]
    time: 0.002; rss: 152MB     llvm module passes [whee15]
    time: 0.190; rss: 152MB     llvm module passes [whee0]
    time: 6.645; rss: 183MB     llvm module passes [whee1]
    time: 0.021; rss: 159MB     LTO passes
    time: 0.013; rss: 161MB     codegen passes [whee9-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.036; rss: 160MB     LTO passes
    time: 0.003; rss: 161MB     LTO passes
    time: 0.004; rss: 162MB     codegen passes [whee12-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.015; rss: 164MB     codegen passes [whee5-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.011; rss: 164MB     LTO passes
    time: 0.007; rss: 165MB     LTO passes
    time: 0.012; rss: 167MB     codegen passes [whee2-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.007; rss: 167MB     codegen passes [whee4-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.073; rss: 166MB     LTO passes
    time: 0.008; rss: 170MB     LTO passes
    time: 0.020; rss: 168MB     LTO passes
    time: 0.008; rss: 168MB     codegen passes [whee7-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.010; rss: 167MB     codegen passes [whee13-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.006; rss: 167MB     LTO passes
    time: 0.004; rss: 167MB     codegen passes [whee3-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.004; rss: 168MB     LTO passes
    time: 0.004; rss: 171MB     codegen passes [whee10-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.005; rss: 172MB     LTO passes
    time: 0.003; rss: 173MB     LTO passes
    time: 0.006; rss: 173MB     codegen passes [whee6-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.004; rss: 173MB     codegen passes [whee15-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.002; rss: 173MB     LTO passes
    time: 0.003; rss: 174MB     codegen passes [whee8-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.060; rss: 173MB     codegen passes [whee0-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.004; rss: 170MB     LTO passes
    time: 0.001; rss: 170MB     LTO passes
    time: 0.002; rss: 170MB     codegen passes [whee11-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 0.001; rss: 170MB     codegen passes [whee14-faa1bfdce812aee96e5ffecf666ddd72.rs]
    time: 3.249; rss: 180MB     LTO passes
    time: 51.579; rss: 174MB    codegen passes [whee1-faa1bfdce812aee96e5ffecf666ddd72.rs]
  time: 61.759; rss: 154MB      LLVM passes
  time: 0.000; rss: 151MB       serialize work products
    time: 0.250; rss: 150MB     running linker
  time: 0.250; rss: 150MB       linking
    Finished release [optimized] target(s) in 62.30 secs

cargo +nightly rustc --release -- -Ztime-passes -Ccodegen-units=1 (63.2s)

$ cargo +nightly rustc --release -- -Ztime-passes -Ccodegen-units=1
   Compiling whee v0.1.0 (file:///home/lampam/asd/clone/cpp_demangle/whee)
  time: 0.000; rss: 46MB        parsing
  time: 0.000; rss: 46MB        recursion limit
  time: 0.000; rss: 46MB        crate injection
  time: 0.000; rss: 46MB        plugin loading
  time: 0.000; rss: 46MB        plugin registration
    time: 0.017; rss: 71MB      expand crate
    time: 0.000; rss: 71MB      check unused macros
  time: 0.017; rss: 71MB        expansion
  time: 0.000; rss: 71MB        maybe building test harness
  time: 0.000; rss: 71MB        maybe creating a macro crate
  time: 0.000; rss: 71MB        creating allocators
  time: 0.000; rss: 71MB        AST validation
  time: 0.001; rss: 72MB        name resolution
  time: 0.000; rss: 72MB        complete gated feature checking
  time: 0.000; rss: 74MB        lowering ast -> hir
  time: 0.000; rss: 74MB        early lint checks
  time: 0.000; rss: 74MB        indexing hir
  time: 0.000; rss: 74MB        load query result cache
  time: 0.000; rss: 74MB        looking for entry point
  time: 0.000; rss: 74MB        looking for plugin registrar
  time: 0.000; rss: 74MB        loop checking
  time: 0.000; rss: 77MB        attribute checking
  time: 0.000; rss: 77MB        stability checking
  time: 0.000; rss: 77MB        type collecting
  time: 0.000; rss: 77MB        outlives testing
  time: 0.000; rss: 77MB        impl wf inference
  time: 0.000; rss: 77MB        coherence checking
  time: 0.000; rss: 77MB        variance testing
  time: 0.000; rss: 77MB        wf checking
  time: 0.000; rss: 77MB        item-types checking
  time: 0.047; rss: 120MB       item-bodies checking
  time: 0.003; rss: 121MB       rvalue promotion
  time: 0.000; rss: 121MB       privacy checking
  time: 0.000; rss: 121MB       intrinsic checking
  time: 0.000; rss: 122MB       match checking
  time: 0.000; rss: 122MB       liveness checking
  time: 0.005; rss: 124MB       borrow checking
  time: 0.000; rss: 124MB       MIR borrow checking
  time: 0.000; rss: 124MB       dumping chalk-like clauses
  time: 0.000; rss: 124MB       MIR effect checking
  time: 0.000; rss: 124MB       death checking
  time: 0.000; rss: 124MB       unused lib feature checking
  time: 0.000; rss: 124MB       lint checking
  time: 0.000; rss: 124MB       resolving dependency formats
    time: 0.000; rss: 124MB     write metadata
    time: 0.057; rss: 134MB     translation item collection
    time: 0.001; rss: 134MB     codegen unit partitioning
    time: 0.000; rss: 134MB     write allocator module
    time: 0.060; rss: 143MB     translate to LLVM IR
    time: 0.000; rss: 143MB     assert dep graph
    time: 0.000; rss: 143MB     serialize dep graph
  time: 0.124; rss: 143MB       translation
    time: 0.034; rss: 142MB     llvm function passes [whee0]
    time: 6.867; rss: 172MB     llvm module passes [whee0]
    time: 55.740; rss: 165MB    codegen passes [whee0]
  time: 62.665; rss: 144MB      LLVM passes
  time: 0.000; rss: 144MB       serialize work products
    time: 0.245; rss: 144MB     running linker
  time: 0.245; rss: 144MB       linking
    Finished release [optimized] target(s) in 63.23 secs

---

$ rustc +nightly --version
rustc 1.27.0-nightly (79252ff4e 2018-04-29)

[JustAPerson]

Seems to have been resolved. Works fine with a recent nightly to compile @ExpHP's example (in addition, with everything uncommented). Appears to have been fixed a while ago as rustc 2019-09-23 works fine too.

cargo +nightly rustc --release -- -Ztime-passes

warning: unused manifest key: profiles
   Compiling issue50323 v0.1.0 (/tmp/issue50323)
time: 0.000; rss: 50MB	parse_crate
time: 0.000; rss: 50MB	attributes_injection
time: 0.000; rss: 50MB	recursion_limit
time: 0.000; rss: 50MB	plugin_loading
time: 0.000; rss: 50MB	plugin_registration
time: 0.000; rss: 50MB	pre_AST_expansion_lint_checks
time: 0.000; rss: 54MB	crate_injection
time: 0.013; rss: 68MB	expand_crate
time: 0.000; rss: 68MB	check_unused_macros
time: 0.013; rss: 68MB	macro_expand_crate
time: 0.000; rss: 68MB	maybe_building_test_harness
time: 0.000; rss: 68MB	AST_validation
time: 0.000; rss: 68MB	maybe_create_a_macro_crate
time: 0.000; rss: 71MB	complete_gated_feature_checking
time: 0.014; rss: 71MB	configure_and_expand
time: 0.000; rss: 71MB	prepare_outputs
time: 0.000; rss: 74MB	hir_lowering
time: 0.000; rss: 74MB	early_lint_checks
time: 0.000; rss: 77MB	validate_HIR_map
time: 0.000; rss: 77MB	setup_global_ctxt
time: 0.000; rss: 77MB	dep_graph_tcx_init
time: 0.001; rss: 77MB	create_global_ctxt
time: 0.000; rss: 77MB	looking_for_entry_point
time: 0.000; rss: 77MB	looking_for_plugin_registrar
time: 0.000; rss: 77MB	looking_for_derive_registrar
time: 0.000; rss: 80MB	misc_checking_1
time: 0.000; rss: 80MB	type_collecting
time: 0.000; rss: 80MB	impl_wf_inference
time: 0.000; rss: 80MB	unsafety_checking
time: 0.000; rss: 80MB	orphan_checking
time: 0.000; rss: 80MB	coherence_checking
time: 0.000; rss: 84MB	wf_checking
time: 0.000; rss: 84MB	item_types_checking
time: 0.028; rss: 99MB	item_bodies_checking
time: 0.028; rss: 99MB	type_check_crate
time: 0.002; rss: 103MB	match_checking
time: 0.000; rss: 103MB	liveness_and_intrinsic_checking
time: 0.003; rss: 103MB	misc_checking_2
time: 0.018; rss: 108MB	MIR_borrow_checking
time: 0.000; rss: 108MB	dumping_chalk_like_clauses
time: 0.000; rss: 108MB	MIR_effect_checking
time: 0.000; rss: 108MB	layout_testing
time: 0.000; rss: 108MB	death_checking
time: 0.000; rss: 108MB	unused_lib_feature_checking
time: 0.000; rss: 108MB	crate_lints
time: 0.000; rss: 108MB	module_lints
time: 0.000; rss: 108MB	lint_checking
time: 0.000; rss: 108MB	privacy_checking_modules
time: 0.001; rss: 108MB	misc_checking_3
time: 0.000; rss: 108MB	monomorphization_collector_root_collections
time: 0.056; rss: 123MB	monomorphization_collector_graph_walk
time: 0.004; rss: 123MB	partition_and_assert_distinct_symbols
time: 0.000; rss: 124MB	write_allocator_module
time: 0.000; rss: 124MB	find_cgu_reuse
time: 0.008; rss: 132MB	llvm function passes [issue50323.aepfjml6-cgu.0]
time: 0.005; rss: 134MB	llvm function passes [issue50323.aepfjml6-cgu.2]
time: 0.002; rss: 138MB	llvm function passes [issue50323.aepfjml6-cgu.5]
time: 0.002; rss: 138MB	llvm function passes [issue50323.aepfjml6-cgu.12]
time: 0.007; rss: 138MB	llvm function passes [issue50323.aepfjml6-cgu.1]
time: 0.008; rss: 140MB	llvm module passes [issue50323.aepfjml6-cgu.5]
time: 0.003; rss: 141MB	llvm function passes [issue50323.aepfjml6-cgu.3]
time: 0.001; rss: 141MB	llvm function passes [issue50323.aepfjml6-cgu.7]
time: 0.006; rss: 141MB	llvm module passes [issue50323.aepfjml6-cgu.7]
time: 0.005; rss: 142MB	llvm function passes [issue50323.aepfjml6-cgu.4]
time: 0.001; rss: 142MB	llvm function passes [issue50323.aepfjml6-cgu.11]
time: 0.001; rss: 142MB	llvm module passes [issue50323.aepfjml6-cgu.11]
time: 0.001; rss: 143MB	llvm function passes [issue50323.aepfjml6-cgu.6]
time: 0.001; rss: 143MB	llvm function passes [issue50323.aepfjml6-cgu.8]
time: 0.003; rss: 144MB	llvm module passes [issue50323.aepfjml6-cgu.8]
time: 0.014; rss: 144MB	llvm module passes [issue50323.aepfjml6-cgu.4]
time: 0.021; rss: 144MB	llvm module passes [issue50323.aepfjml6-cgu.3]
time: 0.001; rss: 144MB	llvm function passes [issue50323.aepfjml6-cgu.9]
time: 0.000; rss: 144MB	llvm module passes [issue50323.aepfjml6-cgu.9]
time: 0.087; rss: 144MB	codegen_to_LLVM_IR
time: 0.000; rss: 144MB	assert_dep_graph
time: 0.000; rss: 144MB	serialize_dep_graph
time: 0.164; rss: 144MB	codegen_crate
time: 0.008; rss: 126MB	llvm module passes [issue50323.aepfjml6-cgu.6]
time: 0.000; rss: 115MB	llvm function passes [issue50323.aepfjml6-cgu.13]
time: 0.003; rss: 115MB	free_global_ctxt
time: 0.001; rss: 115MB	llvm module passes [issue50323.aepfjml6-cgu.13]
time: 0.000; rss: 115MB	llvm function passes [issue50323.aepfjml6-cgu.14]
time: 0.000; rss: 115MB	llvm function passes [issue50323.aepfjml6-cgu.10]
time: 0.000; rss: 115MB	llvm module passes [issue50323.aepfjml6-cgu.14]
time: 0.000; rss: 115MB	llvm function passes [issue50323.aepfjml6-cgu.15]
time: 0.001; rss: 116MB	llvm module passes [issue50323.aepfjml6-cgu.15]
time: 0.001; rss: 116MB	llvm module passes [issue50323.aepfjml6-cgu.10]
time: 0.049; rss: 116MB	llvm module passes [issue50323.aepfjml6-cgu.12]
time: 0.134; rss: 118MB	llvm module passes [issue50323.aepfjml6-cgu.2]
time: 0.143; rss: 118MB	llvm module passes [issue50323.aepfjml6-cgu.0]
time: 0.213; rss: 118MB	llvm module passes [issue50323.aepfjml6-cgu.1]
time: 0.003; rss: 119MB	LTO_passes
time: 0.007; rss: 120MB	codegen passes [issue50323.aepfjml6-cgu.6]
time: 0.013; rss: 122MB	LTO_passes
time: 0.002; rss: 122MB	LTO_passes
time: 0.016; rss: 123MB	LTO_passes
time: 0.016; rss: 123MB	LTO_passes
time: 0.004; rss: 123MB	codegen passes [issue50323.aepfjml6-cgu.8]
time: 0.007; rss: 123MB	codegen passes [issue50323.aepfjml6-cgu.5]
time: 0.001; rss: 123MB	LTO_passes
time: 0.001; rss: 123MB	LTO_passes
time: 0.002; rss: 123MB	codegen passes [issue50323.aepfjml6-cgu.10]
time: 0.009; rss: 123MB	codegen passes [issue50323.aepfjml6-cgu.12]
time: 0.002; rss: 124MB	codegen passes [issue50323.aepfjml6-cgu.7]
time: 0.001; rss: 124MB	LTO_passes
time: 0.001; rss: 124MB	LTO_passes
time: 0.002; rss: 124MB	codegen passes [issue50323.aepfjml6-cgu.9]
time: 0.002; rss: 124MB	codegen passes [issue50323.aepfjml6-cgu.13]
time: 0.002; rss: 124MB	LTO_passes
time: 0.001; rss: 124MB	LTO_passes
time: 0.002; rss: 124MB	codegen passes [issue50323.aepfjml6-cgu.15]
time: 0.001; rss: 124MB	LTO_passes
time: 0.002; rss: 125MB	codegen passes [issue50323.aepfjml6-cgu.11]
time: 0.001; rss: 125MB	codegen passes [issue50323.aepfjml6-cgu.14]
time: 0.021; rss: 125MB	codegen passes [issue50323.aepfjml6-cgu.4]
time: 0.045; rss: 126MB	LTO_passes
time: 0.029; rss: 127MB	codegen passes [issue50323.aepfjml6-cgu.1]
time: 0.086; rss: 128MB	LTO_passes
time: 0.116; rss: 128MB	LTO_passes
time: 0.133; rss: 128MB	LTO_passes
time: 0.048; rss: 128MB	codegen passes [issue50323.aepfjml6-cgu.2]
time: 0.019; rss: 128MB	codegen passes [issue50323.aepfjml6-cgu.3]
time: 0.041; rss: 129MB	codegen passes [issue50323.aepfjml6-cgu.0]
time: 0.456; rss: 129MB	LLVM_passes
time: 0.000; rss: 130MB	join_worker_thread
time: 0.366; rss: 130MB	finish_ongoing_codegen
time: 0.000; rss: 130MB	serialize_work_products
time: 0.000; rss: 130MB	link_binary_check_files_are_writeable
time: 0.112; rss: 130MB	run_linker
time: 0.000; rss: 130MB	link_binary_remove_temps
time: 0.113; rss: 130MB	link_binary
time: 0.113; rss: 130MB	link_crate
time: 0.000; rss: 130MB	llvm_dump_timing_file
time: 0.479; rss: 130MB	link
time: 0.716; rss: 130MB		total
    Finished release [optimized] target(s) in 0.83s

[khuey]

This went away at some point, yeah.