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ICE when linking two extern functions to the same function, but with different signatures #5791

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@doy
extern {
    #[link_name = "malloc"]
    fn malloc1(len: libc::c_int) -> *libc::c_void;
    #[link_name = "malloc"]
    fn malloc2(len: libc::c_int, foo: libc::c_int) -> *libc::c_void;
}

fn main () { }
rustc: /build/src/rust-0.6/src/llvm/include/llvm/Support/Casting.h:197: typename llvm::cast_retty<To, From>::ret_type llvm::cast(const Y&) [with X = llvm::Function; Y = llvm::Value*; typename llvm::cast_retty<To, From>::ret_type = llvm::Function*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
zsh: abort (core dumped)  rustc test3.rs

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