Github user retronym commented on the issue:
https://github.com/apache/spark/pull/19675
I suppose the problematic case is:
```
scala> :javap p2.C$D#$anonfun$test$1
public static final java.lang.String $anonfun$test$1(p2.C$D,
java.lang.String);
descriptor: (Lp2/C$D;Ljava/lang/String;)Ljava/lang/String;
flags: ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC
Code:
stack=2, locals=2, args_size=2
0: new #51 // class
java/lang/StringBuilder
3: dup
4: invokespecial #55 // Method
java/lang/StringBuilder."<init>":()V
7: aload_0
8: invokevirtual #57 // Method
p2$C$D$$$outer:()Lp2/C;
11: invokevirtual #61 // Method
p2/C.c:()Ljava/lang/String;
14: invokevirtual #65 // Method
java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
17: aload_1
18: invokevirtual #65 // Method
java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
21: invokevirtual #68 // Method
java/lang/StringBuilder.toString:()Ljava/lang/String;
24: areturn
LocalVariableTable:
Start Length Slot Name Signature
0 25 0 $this Lp2/C$D;
0 25 1 x Ljava/lang/String;
LineNumberTable:
line 1: 0
MethodParameters:
Name Flags
$this final synthetic
x final
```
Where you'd prefer to eagerly capture `C.this.c`, rather than capturing `D`.
You could do that manually as:
```
scala> :paste -raw
// Entering paste mode (ctrl-D to finish)
package p3; class C { val c = "c"; class D { def test = { val capturedC =
c; (x: String) => capturedC + x } } }
```
In general, this could change semantics, `x` might not be initialized by
`C.<init>` at the time of the lambda capture. Spores is a good solution here:
you have do the rewrite manually (so the semantic change is your
responsibility!), but spores will make sure you've remembered to do it.
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