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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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Merged
merged 3 commits into from
Nov 19, 2024
Merged

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

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ec5cbcc
Do not crash when typing a closure with unknown type, since it can oc…
KacperFKorban Jul 11, 2024
74920d3
Don't typeAhead erroneous parsing trees related to export statements
KacperFKorban Nov 6, 2024
6e28679
Don't explicitly check for error trees in export selectors
KacperFKorban Nov 18, 2024
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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/parsing/Parsers.scala
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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.

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Hmmm, I think that this might actually be the correct fix. I even tried short-circuiting before typing ahead in Namer, but the presentation compiler leverages this for completions.

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Alright, but we should open an issue for a better error messages !

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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@@ -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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@@ -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