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Previous implementation used the `Parser::parse_expr` function in order to extract the format expression. If the first comma following the format expression was mistakenly replaced with a dot, then the next format expression was eaten by the function, because it looked as a syntactically valid expression, which resulted in incorrectly spanned error messages. The way the format expression is exctracted is changed: we first look at the first available token in the first argument supplied to the `format!` macro call. If it is a string literal, then it is promoted as a format expression immediatly, otherwise we fall back to the original `parse_expr`-related method. This allows us to ensure that the parser won't consume too much tokens when a typo is made. A test has been created so that it is ensured that the issue is properly fixed. |
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Cargo.toml |