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Map is implemented as a pointer to a mutable object. Rustdoc never mutates function signatures after constructing them, but the JS engine doesn't know that. To save a bunch of memory, use a single immutable map for every decoded type object with no bindings or generics.
This directory contains some source code for the Rust project, including:
- The bootstrapping build system
- Various submodules for tools, like cargo, tidy, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.