Abort in rustc on valid code

[jleahy]

This is using "rustc 1.0.0-nightly (458a6a2 2015-01-25 21:20:37 +0000)".

Code:

#![start]
#[no_mangle]
fn main() {}

Command line:

rustc test.rs

Error:

test.rs:1:1: 1:10 warning: unused attribute, #[warn(unused_attributes)] on by default
test.rs:1 #![start]
          ^~~~~~~~~
rustc: /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/llvm/include/llvm/Support/Casting.h:237: typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X = llvm::Function; Y = llvm::Value; typename llvm::cast_retty<X, Y*>::ret_type = llvm::Function*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
Aborted

[klutzy]

Sub-issue of #10883. (There's internal main function which calls main function provided by user, so #[no_mangle] causes name clash.)

[jleahy]

Aha, I should have tried removing the "#![start]" to minimize it further.

[nagisa]

Duplicate of #19495