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The parser already does a check-only unescaping which catches all errors. So the checking done in `from_token_lit` never hits. But literals causing warnings can still occur in `from_token_lit`. So the commit changes `str-escape.rs` to use byte string literals and C string literals as well, to give better coverage and ensure the new assertions in `from_token_lit` are correct.
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: