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1901dde97b
There are identical definitions in `rustc_type_ir` and `rustc_ast`. This commit removes them and places a single definition in `rustc_ast_ir`. This requires adding `rust_span` as a dependency of `rustc_ast_ir`, but means a bunch of silly conversion functions can be removed. The one annoying wrinkle is that the old version had differences in their `Debug` impls, e.g. one printed `u32` while the other printed `U32`. Some compiler error messages rely on the former (yuk), and some clippy output depends on the latter. So the commit also changes clippy to not rely on `Debug` and just implement what it needs itself.
The rustc_ast crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), along with some definitions for tokens and token streams, data structures/traits for mutating ASTs, and shared definitions for other AST-related parts of the compiler (like the lexer and macro-expansion).
For more information about how these things work in rustc, see the rustc dev guide: