[vpm] typer synths Function{} for empty-sel match

typedMatchAnonFun is called from typedFunction when the function's body is a match

this is work-in-progres: the compiler currently won't bootstrap under -Yvirtpatmat
see also the pending test

make sure to use the right context in typeFunction when the body is a Match
when typer is set up for type checking a Function, the current owner is the symbol for the function,
but we'll type check a Block(List(ClassDef(cd)), New(cd)) when the function is a match,
and the function symbol is nowhere to be found, so go to outer context

in patmatvirt:
- simplified default case gen (no need for a Casegen instance)
- using CASE | SYNTHETIC to detect generated matches (for switches) and avoid typing them endlessly
  more uniform, and necessary for new-style anon Function class instance gen for matches

1 files changed, 8 insertions, 0 deletions

diff --git a/test/files/pos/virtpatmat_anonfun_for.scala b/test/files/pos/virtpatmat_anonfun_for.scala
new file mode 100644
index 0000000000..8623cd97ba
--- /dev/null
+++ b/test/files/pos/virtpatmat_anonfun_for.scala
@@ -0,0 +1,8 @@
+trait Foo {
+  def bla = {
+    val tvs = "tvs"
+    Nil.foreach(x => x match {
+      case _ => println(tvs)
+    })
+  }
+}
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