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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.