[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, 1 insertions, 0 deletions

diff --git a/test/pending/run/virtpatmat_anonfun_underscore.flags b/test/pending/run/virtpatmat_anonfun_underscore.flags
new file mode 100644
index 0000000000..23e3dc7d26
--- /dev/null
+++ b/test/pending/run/virtpatmat_anonfun_underscore.flags
@@ -0,0 +1 @@
+-Yvirtpatmat
\ No newline at end of file