Already completed forward declaration re-encountered in glfw-rs

[Manishearth]

servo/src/support/glfw/glfw-rs/src/lib/lib.rs:1:1: 1:1 error: internal compiler error: debuginfo::set_members_of_composite_type() - Already completed forward declaration re-encountered.
...
task 'rustc' failed at 'Box<Any>', /home/travis/build/Manishearth/rust/src/libsyntax/diagnostic.rs:99

This seems similar to the already-fixed issue #11083

Note: I'm using a Rust snapshot that I generated on a different system (with the same DEFAULT_TARGET as mine)

cc @michaelwoerister

[Manishearth]

Here's a Travis build with the same error: https://travis-ci.org/Manishearth/servo/builds/25913272#L1935

[michaelwoerister]

Thanks for the report, @Manishearth! This seems to be a regression, possibly related to the internal representation of enums having slightly changed. I'll look into it next week.

[michaelwoerister]

@Manishearth Can you take another look at this with a recent rustc version? Pull request #14486 should have improved the situation here.

[Manishearth]

On it, pushed a new configuration to Travis here.

It certainly won't compile completely since Servo is not yet updated to that version of Rust, but we can see if we're getting the same error. I'll investigate it more locally once Travis finishes.

[Manishearth]

It seems to be trying to compile now. Compiler errors mean that it's working :)

Mind if I leave this bug open for a while till we upgrade to that commit? I'll try to upgrade glfw beforehand and get atleast that crate compiling.

Thanks.

[michaelwoerister]

Sure, let's leave it open until we have a more thorough confirmation that the issue is actually gone.

[Manishearth]

@michaelwoerister Still getting it: https://travis-ci.org/Manishearth/servo#L1945

(Tried it locally too, same error)