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8b35f8e41e
`cook_lexer_literal` can emit an error about an invalid int literal but then return a non-`Err` token. And then `integer_lit` has to account for this to avoid printing a redundant error message. This commit changes `cook_lexer_literal` to return `Err` in that case. Then `integer_lit` doesn't need the special case, and `LitError::LexerError` can be removed.
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: