internal compiler error with undeclared 'self lifetime

[stepancheg]

struct Foo {
    dummy: ()
}

impl Foo {
    fn xx(&'self self) {
    }
}

fn main() {
}

Compiler crashes with:

rust: task failed at 'assertion failed: self.variance.is_some()', /private/tmp/rust-CauM/rust-0.7/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', /private/tmp/rust-CauM/rust-0.7/src/librustc/rustc.rs:354
rust: domain main @0x7f94e9008a10 root task failed

If program is incorrect, compiler should print message and exit.

[pnkfelix]

probably a subbug of #4846

[nikomatsakis]

cc me

[eminence]

Testing on the latest master (dc48adc)

After changing 'self to 'a, there is no longer an ICE. A correct error message is produced:

a.rs:6:12: 6:14 error: use of undeclared lifetime name `'a`
a.rs:6     fn xx(&'a self) {
                  ^~
error: aborting due to previous error

[steveklabnik]

I see the same as @eminence . I think this can be closed.