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When substituting in references to the synthetic values
representing pattern binders, we were replacing:
Select(Ident(o).setType(o.type), TypeName("Inner"))
with:
Select(Ident(x2).setType(typeOf[Outer]), TypeName("Inner"))
The post transform in uncurry would then run:
else if (tree.isType)
TypeTree(tree.tpe) setPos tree.pos
Which would loses track of the outer term `o` and crashes the
compiler in ExplicitOuter.
This commit generates stable references to the binders.
I made this change in the substitutions for all `TreeMakers`,
however only one of seems like it triggers a crash in the
test variations I tried.
Here's how the trees for the first pattern in the test case
change after this patch:
```
@@ -1,30 +1,30 @@
[[syntax trees at end of patmat]] // test.scala
package <empty>{<empty>.type} {
object Test extends scala.AnyRef {
def <init>(): Test.type = {
Test.super{Test.type}.<init>{()Object}(){Object};
(){Unit}
}{Unit};
def main(args: Array[String]): Unit = {
val o1: Outer = Outer.apply{(i: Int)Outer}(5{Int(5)}){Outer};
{
case <synthetic> val x1: Outer = o1{Outer};
case5(){
if (x1.ne{(x$1: AnyRef)Boolean}(null{Null(null)}){Boolean})
matchEnd4{(x: Unit)Unit}({
- val i: Outer#Inner = new x1.Inner{Outer#Inner}{()Outer#Inner}(){Outer#Inner};
+ val i: x1.Inner = new x1.Inner{x1.Inner}{()x1.Inner}(){x1.Inner};
(){Unit}
}{Unit}){Unit}
else
case6{()Unit}(){Unit}{Unit}
}{Unit};
case6(){
matchEnd4{(x: Unit)Unit}(throw new MatchError{MatchError}{(obj: Any)MatchError}(x1{Outer}){MatchError}{Nothing}){Unit}
}{Unit};
matchEnd4(x: Unit){
x{Unit}
}{Unit}
}{Unit}
}{Unit}
}
```
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