Compilation fails in release mode with `debug = true` and `lto = true`.

[dpc]

I've pushed the failing code: https://github.com/dpc/mioco/tree/fails-to-compile . Last commit caused:

[futex:rust/mioco] (fails-to-compile!)% rustc --version
rustc 1.5.0-nightly (47d125d0f 2015-09-16)
[futex:rust/mioco] (fails-to-compile!)% cargo build --release --example echo
   Compiling mioco v0.2.0-pre1 (file:///home/dpc/lab/rust/mioco)
rustc: /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp:713: llv
m::DIE* llvm::DwarfUnit::getOrCreateTypeDIE(const llvm::MDNode*): Assertion `Ty == resolve(Ty->getRef()) && "type was not uniqued, p
ossible ODR violation."' failed.
Could not compile `mioco`.

To learn more, run the command again with --verbose.

[sanxiyn]

I cannot reproduce this. Can you reproduce from the clean build?

This used to be a problem(#26447). I think it is possible that deps compiled by an old compiler before the fix is causing the problem.

[steveklabnik]

This now fails to compile with a regular error for me.

@dpc let us know if you're still seeing this.