Allow autotupling if fn's param is a type param #21741
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odersky
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Nov 4, 2024
| formals.length == 1 && ptIsCorrectProduct(formals.head, args) | ||
| formals.lengthIs == 1 && { | ||
| ptIsCorrectProduct(formals.head, args) | ||
| | formals.head.dealias.isInstanceOf[TypeParamRef] // eg. i21682 |
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I think we need an explanation what goes on here and why the test is necessary and sufficient. Right now I have no idea what goes on here.
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dwijnand
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Nov 6, 2024
| // See i21682 for an example. | ||
| val tup = defn.tupleType(args.map(v => if v.tpt.isEmpty then WildcardType else typedAheadType(v.tpt).tpe)) | ||
| val TypeBounds(lo, hi) = formal.paramInfo | ||
| lo <:< tup && tup <:< hi |
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Btw, I experimented pushing this change into ptIsCorrectProduct and extending it to TypeVar. That way, given that ptIsCorrectProduct is already used by typedFunctionValue, we would allow code like this, from tests/neg/function-arity.scala, to compile:
def unary[T](x: T => Unit) = ???
unary((x, y) => ()) // errorAre we interested in that working?
odersky
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Nov 13, 2024
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This was referenced Mar 6, 2025
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Fixes #21682