ICE: inconsistent resolution for a macro

[matthiaskrgr]

Code

code from ./src/test/ui/macros/issue-78325-inconsistent-resolution.rs

macro_rules! define_other_core {
    ( ) => {
        extern crate std as core;
        //~^ ERROR macro-expanded `extern crate` items cannot shadow names passed with `--extern`
    };
}

fn main() {
    core::panic!();
}

define_other_core!();

clippy 0.0.212 (ffa2e7a 2020-10-24)

Error output

error: macro-expanded `extern crate` items cannot shadow names passed with `--extern`
  --> ./src/test/ui/macros/issue-78325-inconsistent-resolution.rs:3:9
   |
3  |         extern crate std as core;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
...
12 | define_other_core!();
   | --------------------- in this macro invocation
   |
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

thread 'rustc' panicked at 'compiler/rustc_resolve/src/macros.rs:892:21: inconsistent resolution for a macro', /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/compiler/rustc_middle/src/util/bug.rs:34:26
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new

note: Clippy version: clippy 0.0.212 (ffa2e7a 2020-10-24)

query stack during panic:
end of query stack
error: aborting due to previous error

Backtrace

error: macro-expanded `extern crate` items cannot shadow names passed with `--extern`
--> ./src/test/ui/macros/issue-78325-inconsistent-resolution.rs:3:9
 |
3  |         extern crate std as core;
 |         ^^^^^^^^^^^^^^^^^^^^^^^^^
...
12 | define_other_core!();
 | --------------------- in this macro invocation
 |
 = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

thread 'rustc' panicked at 'compiler/rustc_resolve/src/macros.rs:892:21: inconsistent resolution for a macro', /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/compiler/rustc_middle/src/util/bug.rs:34:26
stack backtrace:
 0:     0x7feef36dfa20 - std::backtrace_rs::backtrace::libunwind::trace::h303a626d53553a64
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/../../backtrace/src/backtrace/libunwind.rs:100:5
 1:     0x7feef36dfa20 - std::backtrace_rs::backtrace::trace_unsynchronized::h6abb882733c3f18c
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
 2:     0x7feef36dfa20 - std::sys_common::backtrace::_print_fmt::h57829321f1d9217a
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/sys_common/backtrace.rs:67:5
 3:     0x7feef36dfa20 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h400b66a054640aac
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/sys_common/backtrace.rs:46:22
 4:     0x7feef374ee9c - core::fmt::write::h1857a60b204f1b6a
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/core/src/fmt/mod.rs:1076:17
 5:     0x7feef36d1642 - std::io::Write::write_fmt::h6453b28c8b27c6ea
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/io/mod.rs:1516:15
 6:     0x7feef36e49d5 - std::sys_common::backtrace::_print::h15cc4b3923cc9bc0
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/sys_common/backtrace.rs:49:5
 7:     0x7feef36e49d5 - std::sys_common::backtrace::print::h953c7be178c0674d
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/sys_common/backtrace.rs:36:9
 8:     0x7feef36e49d5 - std::panicking::default_hook::{{closure}}::h635d667f571198f0
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/panicking.rs:208:50
 9:     0x7feef36e4678 - std::panicking::default_hook::h3bc2efb48060abaa
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/panicking.rs:227:9
10:     0x55e96bc0e491 - clippy_driver::report_clippy_ice::h76ee1ad508e689ae
11:     0x7feef36e5216 - std::panicking::rust_panic_with_hook::h887eb0c89f46b8b2
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/panicking.rs:581:17
12:     0x7feef4d7997b - std::panicking::begin_panic::{{closure}}::hb657156772fa8b9a
13:     0x7feef4d7983c - std::sys_common::backtrace::__rust_end_short_backtrace::h4588e5843e10abe9
14:     0x7feef4d798e0 - std::panicking::begin_panic::hd64eac5cb71b9d63
15:     0x7feef4dcb23d - rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}::h5a34d8d2d571ae38
16:     0x7feef4dcb0ee - rustc_middle::ty::context::tls::with_opt::{{closure}}::hbbfc03c4096489df
17:     0x7feef4dcb05f - rustc_middle::ty::context::tls::with_opt::h5b1032e14003a23c
18:     0x7feef4dcb189 - rustc_middle::util::bug::opt_span_bug_fmt::hcc47d648f36a640d
19:     0x7feef4dcb143 - rustc_middle::util::bug::span_bug_fmt::hf90edff983ff5989
20:     0x7feef4e43ab3 - rustc_resolve::macros::<impl rustc_resolve::Resolver>::finalize_macro_resolutions::{{closure}}::h4c09398ec40c230a
21:     0x7feef4e4f528 - rustc_resolve::Resolver::resolve_crate::h560f3cbeb6c0e20b
22:     0x7feef41ed147 - rustc_interface::passes::configure_and_expand_inner::h246e5f9cb7da99d5
23:     0x7feef41b75f5 - rustc_interface::passes::configure_and_expand::{{closure}}::h5275f520a461aac1
24:     0x7feef419b74f - rustc_data_structures::box_region::PinnedGenerator<I,A,R>::new::h3e3420be26fe1a14
25:     0x7feef41ea5d6 - rustc_interface::passes::configure_and_expand::ha882a48bb5edcb36
26:     0x7feef421c77b - rustc_interface::queries::Queries::expansion::h5a91dce74685e0cf
27:     0x7feef3fc7f16 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h6eb07f11eba80bd6
28:     0x7feef3f8f2a2 - rustc_span::with_source_map::h3820d41b3a036910
29:     0x7feef3fc99c2 - rustc_interface::interface::create_compiler_and_run::h08ad396f4e7721e0
30:     0x7feef3fb1d5a - scoped_tls::ScopedKey<T>::set::hd425a36fbe06985e
31:     0x7feef3fce9b5 - std::sys_common::backtrace::__rust_begin_short_backtrace::h23925571219dbc63
32:     0x7feef3f4c3ce - core::ops::function::FnOnce::call_once{{vtable.shim}}::h43b61b9af30b3669
33:     0x7feef36f421a - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h88864ee659ddb161
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/alloc/src/boxed.rs:1042:9
34:     0x7feef36f421a - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h9f03cbdc7ab33431
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/alloc/src/boxed.rs:1042:9
35:     0x7feef36f421a - std::sys::unix::thread::Thread::new::thread_start::h5979dd5560a11418
                             at /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/sys/unix/thread.rs:89:17
36:     0x7feef35d93e9 - start_thread
37:     0x7feef33c1293 - __GI___clone
38:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new

note: Clippy version: clippy 0.0.212 (ffa2e7a 2020-10-24)

query stack during panic:
end of query stack
error: aborting due to previous error

[ebroto]

This one seems to affect the Resolver. It does not reproduce with the current master/nightly (playground)