Regression: Option<~str> in static struct => internal compiler error

[stepancheg]

pub struct UninterpretedOption_NamePart {
    name_part: Option<~str>,
}

impl<'self> UninterpretedOption_NamePart {
    pub fn default_instance() -> &'static UninterpretedOption_NamePart {
        static instance: UninterpretedOption_NamePart = UninterpretedOption_NamePart {
            name_part: None,
        };
        &'static instance
    }
}

fn main() {}

Compiler from master crashes with:

task <unnamed> failed at 'No enclosing scope for id 20', /Users/yozh/devel/rust-ide/rust/src/librustc/middle/region.rs:122
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 to get further details and report the results to github.com/mozilla/rust/issues
task <unnamed> failed at 'explicit failure', /Users/yozh/devel/rust-ide/rust/src/librustc/rustc.rs:371

It is regression, code works in 0.7.

P. S. Compiler knows id of AST node, it could also report file and line number.

[alexcrichton]

Good news! This has somehow been fixed in the meantime since a few months ago.

Flagging as needstest.