RUST_LOG=::rt::backtrace appears to do nothing

[lilyball]

When running a program that hits an assert!(), using RUST_LOG=::rt::backtrace makes no difference in the output. No backtrace is reported on the task failure.

> RUST_LOG=::rt::backtrace ./myprog
rust: task failed at 'left: 9 does not equal right: 10', /Users/kevin/Dev/rust/rust/src/libstd/vec.rs:1605

This is with rustc 0.6 (c8c60f0 2013-05-28 18:34:51 -0700) running on Mac OS X 10.8.3

[jbclements]

per IRC conversation, this is apparently known to be broken (on Mac OS X). Not much help, I know... gdb does apparently work, though, if that helps.

[jbclements]

Nominating for production-ready.

[jbclements]

closing as dup of 1650