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Fix:Resolve ambiguous overload between empty param list and v… #24873

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Fix:Resolve ambiguous overload between empty param list and v… #24873

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dd76912
Fix #24871: Resolve ambiguous overload between empty param list and v…
krrish175-byte Dec 31, 2025
a585482
Simplify isVarArgsMethod check as suggested in review
krrish175-byte Jan 2, 2026
878da47
Fix test file: wrap for-yield expression in object method
krrish175-byte Jan 3, 2026
48a81e5
Fix bootstrap test failures in overload resolution between empty para…
krrish175-byte Jan 4, 2026
d041779
Remove debug prints and delete ambiguous test i24871
krrish175-byte Jan 12, 2026
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4 changes: 3 additions & 1 deletion compiler/src/dotty/tools/dotc/typer/Applications.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -2037,7 +2037,9 @@ trait Applications extends Compatibility {
def isAsGood(alt1: TermRef, tp1: Type, alt2: TermRef, tp2: Type): Boolean = trace(i"isAsGood $tp1 $tp2", overload) {
tp1 match
case tp1: MethodType => // (1)
tp1.paramInfos.isEmpty && tp2.isInstanceOf[LambdaType]
tp1.paramInfos.isEmpty
&& tp2.isInstanceOf[LambdaType]
&& !tp2.isVarArgsMethod
|| {
if tp1.isVarArgsMethod then
tp2.isVarArgsMethod
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12 changes: 12 additions & 0 deletions tests/pos/i24871.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
class C[T]

object X:
def apply(xs: Int*)(d: Double) = Nil
def apply[T](xs: Int*)(t: C[T])(d: Double) = Nil
def apply()(d: Double) = List(List(d))
def apply[T]()(t: C[T])(d: Double) = List(List(d))

for
List(x) <- X()(.0)
yield
x
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@som-snytt som-snytt Jan 3, 2026

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The test file is an ordinary compilation unit, so a top-level expression isn't supported.

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