SI-9387 Fix VerifyError introduced by indylambda

As with regular `Apply`-s, we should compute the generated type
based on the function's type, rather than the expected type.

In the test case, the expected type was void. Now, we correctly
use the generated type of `scala/Function1`, which is enough
to generate a subsequent POP instruction.

The tree shape involved was:

```
arg0 = {
  {
    $anonfun()
  };
  scala.runtime.BoxedUnit.UNIT
}
```

1 files changed, 2 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/backend/jvm/BCodeBodyBuilder.scala b/src/compiler/scala/tools/nsc/backend/jvm/BCodeBodyBuilder.scala
index c3f71969f6..aeb57613af 100644
--- a/src/compiler/scala/tools/nsc/backend/jvm/BCodeBodyBuilder.scala
+++ b/src/compiler/scala/tools/nsc/backend/jvm/BCodeBodyBuilder.scala
@@ -632,10 +632,11 @@ abstract class BCodeBodyBuilder extends BCodeSkelBuilder {
             case _ =>
               abort(s"Cannot instantiate $tpt of kind: $generatedType")
           }
-        case Apply(_, args) if app.hasAttachment[delambdafy.LambdaMetaFactoryCapable] =>
+        case Apply(fun, args) if app.hasAttachment[delambdafy.LambdaMetaFactoryCapable] =>
           val attachment = app.attachments.get[delambdafy.LambdaMetaFactoryCapable].get
           genLoadArguments(args, paramTKs(app))
           genInvokeDynamicLambda(attachment.target, attachment.arity, attachment.functionalInterface)
+          generatedType = asmMethodType(fun.symbol).returnType
 
         case Apply(fun @ _, List(expr)) if currentRun.runDefinitions.isBox(fun.symbol) =>
           val nativeKind = tpeTK(expr)