Garbled error messages when building multiple binaries from same sources

[osklil]

If you build two different binaries from the same source files, error messages are repeated and mostly garbled.

How to reproduce

cargo new demo
echo -e '\n[[bin]]\nname = "p1"\npath = "src/main.rs"\n\n[[bin]]\nname = "p2"\npath = "src/main.rs"' >> demo/Cargo.toml
echo something > demo/src/main.rs
cd demo; cargo build

Actual output

   Compiling demo v0.1.0 (file:///home/usel/_t2/demo)
src/main.rs:1:1: 1:10 error: expected item, found `something`
src/main.rs:1:1: 1:10 src/main.rs:1 errorsomething:
              expected item, found `something`^~~~~~~~~

errorsrc/main.rs: aborting due to previous error:1
something
              ^~~~~~~~~
error: aborting due to previous error
Build failed, waiting for other jobs to finish...
error: Could not compile `demo`.

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

Expected output

   Compiling demo v0.1.0 (file:///[...]/demo)
src/main.rs:1:1: 1:10 error: expected item, found `something`
src/main.rs:1 something
              ^~~~~~~~~
error: aborting due to previous error
error: Could not compile `demo`.

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

[osklil]

cargo 0.12.0-nightly (6b98d1f 2016-07-04)

[alexcrichton]

Thanks for the report! This is actually a dupe of #1198 which is also being fixed over at rust-lang/rust#35975, so I'm going to close in favor of those.