improvement: Simplify match types when possible#23146
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tgodzik merged 1 commit intoscala:mainfrom May 13, 2025
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tgodzik
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May 13, 2025
| s"""|toString(): String | ||
| |toArray: Array[Object] | ||
| |toIArray: IArray[Object] | ||
| |toList: List[Int] |
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PReviously this was shown as a full match type
kasiaMarek
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May 13, 2025
| val returnType = tpe(gtpe.finalResultType) | ||
| val retType = gtpe.finalResultType | ||
| val simplified = if (retType.typeSymbol.isAliasType) retType else retType.deepDealiasAndSimplify | ||
| val returnType = tpe(simplified) |
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Won't simplified negatively impact union types?
def f(): Int | String = ???
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Added a test, it seems to work. I don't think it will simplify something it's unable to simplify more. Do you have another example that might highlight the issue?
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It's fine then, I think it works as we'd like it to. 😄 I saw it does lub on OrType but it seems to still return an unchanged OrType, maybe it only collapses same cases.
kasiaMarek
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May 13, 2025
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tgodzik
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Fixes scalameta/metals#7004 [Cherry-picked e5a9355][modified]
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Fixes scalameta/metals#7004