Incorrect "multiple matching crates" with duplicate path

[emberian]

For example, if you do rustc -L . -L ., and you have extern mod foo with a foo crate in ., it will report "multiple matching crates for foo", even though it's the same crate.

[emberian]

What it should probably do is remove duplicates from addl_lib_search_paths in the session::options

[Xazax-hun]

Or alternatively make addl_lib_search_paths to be a set?

[emberian]

That'd work, I can't imagine why one would need to index into it.

[metajack]

nominating production ready. this is likely to catch people out who are using makefiles.

[catamorphism]

Accepted production-ready