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Do not search contextual function type in union types in general #24393

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Merged
merged 2 commits into from
Nov 13, 2025
+12 −1
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Do not search contextual function type in union types in general #24393

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604f409
Do not search contextual function type in union types in general
noti0na1 Nov 12, 2025
504068c
Update tests/explicit-nulls/pos/union-contains-contextual-function.scala
noti0na1 Nov 13, 2025
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4 changes: 3 additions & 1 deletion compiler/src/dotty/tools/dotc/core/Definitions.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -2002,11 +2002,13 @@ class Definitions {
* - the upper bound of a TypeParamRef in the current constraint
*/
def asContextFunctionType(tp: Type)(using Context): Type =
tp.stripNull().stripTypeVar.dealias match
tp.stripTypeVar.dealias match
case tp1: TypeParamRef if ctx.typerState.constraint.contains(tp1) =>
asContextFunctionType(TypeComparer.bounds(tp1).hiBound)
case tp1 @ PolyFunctionOf(mt: MethodType) if mt.isContextualMethod =>
tp1
case tp: FlexibleType =>
asContextFunctionType(tp.hi)
case tp1 =>
if tp1.typeSymbol.name.isContextFunction && isFunctionNType(tp1) then tp1
else NoType
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9 changes: 9 additions & 0 deletions tests/explicit-nulls/pos/union-contains-contextual-function.scala
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@@ -0,0 +1,9 @@
class Test:
val x: ((a: String) ?=> Int) | Null = null

val x2: ((a: String) ?=> Int) | Null = (s: String) ?=> 42

val y: ((a: String) ?=> Int) | String = "hello"

def f(g: ((a: String) ?=> Int) | Null = null) = ???

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