Path to Cargo.toml is shown in the project settings.
Find usages is enabled for all symbols.
Fixes
Method calls and field references are properly highlighted.
RUSTC environmental variable is passed to cargo, so it now works even
without rustc in PATH (by @madisp)
Refactorings
JFlex was upgraded to the patched version from intellij community repository.
It is now asymptotically faster in some cases (most notably, for markdown doc
comments).