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Do not crash when typing a closure with unknown type, since it can occur for erroneous input #21178

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Do not crash when typing a closure with unknown type, since it can occur for erroneous input #21178

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/parsing/Parsers.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1725,7 +1725,7 @@ object Parsers {
case arg =>
arg
val args1 = args.mapConserve(sanitize)

if in.isArrow || isPureArrow || erasedArgs.contains(true) then
functionRest(args)
else
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2 changes: 0 additions & 2 deletions compiler/src/dotty/tools/dotc/typer/Typer.scala
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Expand Up @@ -1977,8 +1977,6 @@ class Typer(@constructorOnly nestingLevel: Int = 0) extends Namer
// Polymorphic SAMs are not currently supported (#6904).
EmptyTree
case tp =>
if !tp.isErroneous then
throw new java.lang.Error(i"internal error: closing over non-method $tp, pos = ${tree.span}")
Comment on lines -1980 to -1981
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I don't think this is the correct fix. IMHO, for this kind of errors, we shouldn't run the typer in the first place.

TypeTree(defn.AnyType)
}
else typed(tree.tpt)
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7 changes: 7 additions & 0 deletions tests/neg/i20511-1.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
package pakiet

def toppingPrice(size: Int): Double = ???

def crustPrice(crustType: Double): Double = ???

export toppingPrice.apply, crustPrice.unlift // error // error // error
8 changes: 8 additions & 0 deletions tests/neg/i20511.scala
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Can you also add the checkfiles. Thanks.

Note that with this fix, the produced error message is not helpful at all and confuses even more

Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
package pakiet

def toppingPrice(size: Int): Double = ???

def crustPrice(crustType: Double): Double = ???

export toppingPrice, crustPrice // error // error
val i = 1 // error
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