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Fix #3542: Avoid comparisons between method types and typevars #3727

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Merged
merged 1 commit into from
Jan 2, 2018
Merged

Fix #3542: Avoid comparisons between method types and typevars #3727

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/typer/Namer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1106,7 +1106,7 @@ class Namer { typer: Typer =>
mdef match {
case mdef: DefDef if mdef.name == nme.ANON_FUN =>
val hygienicType = avoid(rhsType, paramss.flatten)
if (!(hygienicType <:< tpt.tpe))
if (!hygienicType.isValueType || !(hygienicType <:< tpt.tpe))
ctx.error(i"return type ${tpt.tpe} of lambda cannot be made hygienic;\n" +
i"it is not a supertype of the hygienic type $hygienicType", mdef.pos)
//println(i"lifting $rhsType over $paramss -> $hygienicType = ${tpt.tpe}")
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5 changes: 5 additions & 0 deletions tests/neg/i3542a.scala
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@@ -0,0 +1,5 @@
object Foo {
def f()()(implicit ctx: String): Int = ???
def at[T](op: () => T): Unit = ()
at(() => f()) // error: missing ()
}