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Fix #2732: Allow wildcards in SAM types #3347

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Fix #2732: Allow wildcards in SAM types #3347

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10 changes: 1 addition & 9 deletions compiler/src/dotty/tools/dotc/core/Types.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -3717,16 +3717,8 @@ object Types {
case _ =>
NoType
}
def isInstantiatable(tp: Type)(implicit ctx: Context): Boolean = zeroParamClass(tp) match {
case cinfo: ClassInfo =>
val tref = tp.narrow
val selfType = cinfo.selfType.asSeenFrom(tref, cinfo.cls)
tref <:< selfType
case _ =>
false
}
def unapply(tp: Type)(implicit ctx: Context): Option[SingleDenotation] =
if (isInstantiatable(tp)) {
if (zeroParamClass(tp).exists) {
val absMems = tp.abstractTermMembers
// println(s"absMems: ${absMems map (_.show) mkString ", "}")
if (absMems.size == 1)
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8 changes: 8 additions & 0 deletions tests/pos/i2732.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
object Foo {
// Example 1
val fun: java.util.function.Function[String, _ <: String] = x => x

// Example 2
val map = new java.util.HashMap[String, String]
map.computeIfAbsent("hello", foo => "world")
}