rusti seg faults with non-ascii comments #8924

$ rust -v
rust 0.8-pre (04fac7f 2013-08-31 15:15:40 -0700)
host: x86_64-unknown-linux-gnu

$ rusti
WARNING: The Rust REPL is experimental and may be
unstable. If you encounter problems, please use the
compiler instead. Type :help for help.
rusti> let a = 123; // 日本語
zsh: segmentation fault (core dumped)  rusti

$ rusti
WARNING: The Rust REPL is experimental and may be
unstable. If you encounter problems, please use the
compiler instead. Type :help for help.
rusti> let a = 123; // 中华
zsh: segmentation fault (core dumped)  rusti

$ rusti
WARNING: The Rust REPL is experimental and may be
unstable. If you encounter problems, please use the
compiler instead. Type :help for help.
rusti> let a = 123; // Việt Nam
zsh: segmentation fault (core dumped)  rusti

$ rusti
WARNING: The Rust REPL is experimental and may be
unstable. If you encounter problems, please use the
compiler instead. Type :help for help.
rusti> lest a = 123; // 日本語
<anon>:2:6: 2:7 error: expected one of `; }` but found `a`
<anon>:2  lest a = 123; // 日本語
               ^
task <unnamed> failed at 'explicit failure', /home/nksm/pkg/rust/src/rust/src/libsyntax/diagnostic.rs:69
rusti> let a = 123;
zsh: segmentation fault (core dumped)  rusti

$ rust -v
rust 0.7
host: x86_64-unknown-linux-gnu

$ rusti
WARNING: The Rust REPL is experimental and may be
unstable. If you encounter problems, please use the
compiler instead. Type :help for help.
rusti> let a = 123; // 中华
rusti> let a = 123; // 日本語
rusti> let a = 123; // Việt Nam
rusti>