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ec1d008f65
Added doc about behavior of extend on HashMap It was unclear what the implementation does when it encounters existing keys. This change makes it clear by documenting the trait impl.
This directory contains the source code of the rust project, including:
rustcand its testslibstd- Various submodules for tools, like rustdoc, rls, etc.
For more information on how various parts of the compiler work, see the rustc guide.
There is also useful content in this README: https://github.com/rust-lang/rust/tree/master/src/librustc/infer/lexical_region_resolve.