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-rw-r--r--src/compiler/scala/reflect/internal/Definitions.scala4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/compiler/scala/reflect/internal/Definitions.scala b/src/compiler/scala/reflect/internal/Definitions.scala
index a2dd6fc4c3..09c2228b01 100644
--- a/src/compiler/scala/reflect/internal/Definitions.scala
+++ b/src/compiler/scala/reflect/internal/Definitions.scala
@@ -601,8 +601,8 @@ trait Definitions extends reflect.api.StandardDefinitions {
def isFunctionType(tp: Type): Boolean = tp.normalize match {
case TypeRef(_, sym, args) if args.nonEmpty =>
- val len = args.length
- len < MaxFunctionArity && sym == FunctionClass(len - 1)
+ val arity = args.length - 1 // -1 is the return type
+ arity <= MaxFunctionArity && sym == FunctionClass(arity)
case _ =>
false
}