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Don't leave underspecified SAM types in the code #19461

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Jan 16, 2024
Merged

Don't leave underspecified SAM types in the code #19461

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3 changes: 1 addition & 2 deletions compiler/src/dotty/tools/dotc/typer/Typer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1738,8 +1738,7 @@ class Typer(@constructorOnly nestingLevel: Int = 0) extends Namer
// Replace the underspecified expected type by one based on the closure method type
defn.PartialFunctionOf(mt.firstParamTypes.head, mt.resultType)
else
report.error(em"result type of lambda is an underspecified SAM type $samParent", tree.srcPos)
samParent
errorType(em"result type of lambda is an underspecified SAM type $samParent", tree.srcPos)
TypeTree(targetTpe)
case _ =>
if (mt.isParamDependent)
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4 changes: 4 additions & 0 deletions tests/neg/i15785.scala
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@@ -0,0 +1,4 @@
trait SAMFunction1[-T1, +R]:
def apply(x1: T1): R

def fooSAM[T](foo: SAMFunction1[T, T] = (f: T) => f): Unit = () // error
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