ICE with self region

[Kimundi]

pub trait AsciiCast<'self, T>{
    fn to_ascii(&'self self) -> T;
    fn is_ascii(&'self self) -> bool;
}

only output:

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

[nikomatsakis]

This is probably a bug in the region inference code.

[nikomatsakis]

sorry, the region parameterization inference.

[jbclements]

FWIW, I reproduced this (though I had to add a 'main' to get that far). Here's the result with backtrace:

jclements-09740:~/rust/build clements> RUST_LOG=rustc=1,::rt::backtrace !!
RUST_LOG=rustc=1,::rt::backtrace rustc /tmp/foo4.rs
Running /Users/clements/rust/build/x86_64-apple-darwin/stage2/bin/rustc:
rust: task failed at 'assertion failed: self.variance.is_some()', /Users/clements/rust/src/librustc/middle/typeck/rscope.rs:181
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/clements/rust/src/librustc/rustc.rc:368
rust: domain main @0x7ff95c019210 root task failed

[msullivan]

Still ICEs.

[pnkfelix]

possible dupe of #6157.

[erickt]

Probably a subbug of #4846.

[eminence]

Testing on the latest master (dc48adc)

After changing 'self to 'a, the original code compiles cleanly with no ICE.

[flaper87]

The code in the example now outputs.

test.rs:1:22: 1:26 error: invalid lifetime name: 'self is no longer a special lifetime
test.rs:1 pub trait AsciiCast<'self, T>{

rustc 0.10-pre (1d80a9a 2014-01-29 01:06:41 -0800)
host: x86_64-unknown-linux-gnu

closing.