1f6abb7fba
If you are opening libcore from rust-lang/rust as opposed to e.g. goto definition from some other crate which would use the sysroot instance of libcore, a `#![cfg(not(test))]` would previously have made all the code excluded from the module tree, breaking the editor experience. This puts in a slight hack that checks for the crate name "core" and turns off `#[cfg(test)]`.