Detect quoted pattern variables in alternatives #15073
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smarter
reviewed
Apr 30, 2022
| case Typed(pat, _) => rec(pat) | ||
| case UnApply(_, _, pats) => pats.foreach(rec) | ||
| case pat: Bind => | ||
| report.error(IllegalVariableInPatternAlternative(pat.symbol.name), pat.withSpan(pat.nameSpan)) |
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How come we need to check this here, isn't typedBind going to run on this tree later and produce the same error via https://github.com/lampepfl/dotty/blob/400427db21410b366e4d9b890d73cec15416b632/compiler/src/dotty/tools/dotc/typer/Typer.scala#L2141-L2142 ?
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The context at that point lost the mode InPatternAlternative. Now I found out where that is happening and will push a better fix.
We use typedExpr to type the contents of a quoted pattern. In that case it must not have the Pattern mode mut should keep the InPatternAlternative because it will be needed in the pattern located in the splices.
smarter
approved these changes
May 5, 2022
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Fixes #14696