mbe: Rework the concat metavariable expression
#142975
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…ation, r=petrochenkov mbe: Add tests and restructure metavariable expressions Add tests that show better diagnostics, and factor `concat` handling to a separate function. Each commit message has further details. This performs the nonfunctional perparation for further changes such as rust-lang#142950 and rust-lang#142975 .
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Rollup merge of #143245 - tgross35:metavariable-expr-organization, r=petrochenkov mbe: Add tests and restructure metavariable expressions Add tests that show better diagnostics, and factor `concat` handling to a separate function. Each commit message has further details. This performs the nonfunctional perparation for further changes such as #142950 and #142975 .
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☔ The latest upstream changes (presumably #143267) made this pull request unmergeable. Please resolve the merge conflicts. |
The current messages have the potential to be more accurate; "expected identifier or string literal" is printed in a few cases where only an identifier should be expected, and it suggests removing string literals when that might not solve the problem. Add a new diagnostic for these kind of errors that gives some more context. For `count` and `ignore` this should likely be combined with the diagnositcs for `eat_dollar` to produce a helpful error if they get anything other than a metavariable first argument. I am planning to do this in a followup.
Give a more user-friendly diagnostic about the following:
* Invalid syntax within the `${...}` braces, including missing
parentheses or trailing tokens.
* Incorrect number of arguments passed to specific metavariable
expressions.
* Now accept numbers, chars * Suffixes are stripped (needs more testing) * Report specific locations of errors * TODO: handle idents the same for expanded tokens
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#142950 plus followup
r? @ghost