wio causes LLVM to explode violently

[DanielKeep]

Firstly, this is based on commit 5a80521 because the current HEAD doesn't typecheck on 64-bit.

Checking out and building wio with cargo build --release --target x86_64-pc-windows-msvc with the latest version of the VC++ Build Tools and rustc 1.8.0-nightly (ce4b75f25 2016-02-12) (latest nightly as of 2016-02-13), produces:

[master] > cargo build --release --target x86_64-pc-windows-msvc
   Compiling wio v0.1.1 (file:///F:/Scratch/repos/wio-rs)
Assertion failed!

Program: C:\Users\drk\AppData\Local\.multirust\toolchains\nightly\bin\rustc.exe File: C:/bot/slave/nightly-dist-rustc-win-gnu-32/build/src/llvm/include/llvm/ADT/DenseMap.h, Line 1025

Expression: isHandleInSync() && "invalid iterator access!"

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
Could not compile `wio`.

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

Followed by a "rustc.exe has stopped working" dialog with the following:

Problem signature:
Problem Event Name: APPCRASH
Application Name: rustc.exe
Application Version: 0.0.0.0
Application Timestamp: 38666230
Fault Module Name: rustc_llvm-fd663c41.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 6c756465
Exception Code: 40000015
Exception Offset: 014057d8
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 3081
Additional Information 1: 8d13
Additional Information 2: 8d133e790ce9876f6238c6d446efdb4e
Additional Information 3: e1a4
Additional Information 4: e1a4fcae1a4e1dbed8f1806581b8db85

I do not get this crash on non-release, nor do I get it for i686-pc-windows-gnu (debug or release).

[retep998]

A good thing to point out here is that you used i686-pc-windows-gnu for the host and x86_64-pc-windows-msvc for the target so it is a cross compile.

[DanielKeep]

To be even more muchly explicit, I used these two archives:

• https://static.rust-lang.org/dist/2016-02-13/rust-nightly-i686-pc-windows-gnu.msi
• https://static.rust-lang.org/dist/2016-02-13/rust-std-nightly-x86_64-pc-windows-msvc.tar.gz