LLVM assertion failure when compiling winapi with the latest nightly

[CensoredUsername]

When compiling a project that depends on winapi on the latest nightly, the compilation halts due to an llvm assertion failure while winapi is being built.

Error message:

Assertion failed: !isa<DIType>(Scope) && "shouldn't make a namespace scope for a type", file C:\bot\slave\nightly-dist-rustc-win-msvc-64\build\src\llvm\lib\CodeGen\AsmPrinter\CodeViewDebug.cpp, line 202

Toolchain/platform info

rustc --version
rustc 1.13.0-nightly (e9bc1bac8 2016-08-24)

toolchain: nightly-x86_64-pc-windows-msvc

winapi version: v0.2.8
winapi-build version: v0.1.1

[alexcrichton]

cc @eddyb, MIR related?

[eddyb]

Doubtful, especially if the previous nightly worked. cc @rust-lang/compiler

[ruuda]

I am seeing the same error when compiling scoped_threadpool, see this ci build. It’s compiling Convector 209010ec with rustc 1.13.0-nightly (e9bc1bac8 2016-08-24) on Windows.

[eddyb]

@ruuda Did it start on that nightly, i.e. does it work with the previous nightly?

[ruuda]

@eddyb: The previous ci build is a bit older, it was 1.13.0-nightly (f883b0bba 2016-08-19), and it passed. I could try to reproduce locally. Are older nightly installers archived somewhere?

[eddyb]

If you use rustup you can just pick a date, or you can download manually.
Given the commit range, this could be #35764, although it's not clear to me how, just yet.

[TimNN]

For scoped_threadpool, nightly-2016-08-23 is fine while nightly-2016-08-25 failes.

[TimNN]

Minimal repro (even on non-windows platforms with cargo +nightly-2016-08-25 build --target i686-pc-windows-msvc):

struct Foo;

impl Drop for Foo {
    fn drop(&mut self) {
        panic!();
    }
}

[TimNN]

i686-pc-windows-gnu is fine, i686-pc-windows-msvc fails.

[TimNN]

Even smaller:

fn bar() {
    panic!();
}

[retep998]

I am legitimately wondering how this could get past CI when we have auto-win-msvc-64-cargotest which builds the latest winapi among other crates.

[eddyb]

@retep998 The bots don't have LLVM assertions enabled 😿.