ICE with task::try { fail!("failed") }

[lilyball]

Compiling the following program:

fn main() {
    do std::task::try {
        fail!("failed");
    };
    println("try worked");
}

results in an ICE:

> env RUST_LOG=rustc1=,::rt::backtrace rustc foo.rs
rust: task failed at 'ty_fn_sig() called on non-fn type: &ty_err', /Users/kevin/Dev/rust/rust/src/librustc/middle/ty.rs:2803
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug
note: try running with RUST_LOG=rustc=1,::rt::backtrace to get further details and report the results to github.com/mozilla/rust/issues
rust: task failed at 'explicit failure', /Users/kevin/Dev/rust/rust/src/librustc/rustc.rc:400
rust: domain main @0x7f9983808410 root task failed

This is with current tip of incoming on OS X:

rustc 0.6 (237dce1 2013-05-30 17:22:49 -0700)
host: x86_64-apple-darwin

[jdm]

Paging @catamorphism for ty_err reference.

[lilyball]

This ICE has apparently been fixed. The problem was it didn't know the final type of the do expression.