[TypeChecker] NFC: Add test-case for rdar://112095973

Author: xedin

validation-test/Sema/type_checker_crashers_fixed/rdar112095973.swift

@@ -0,0 +1,7 @@
+// RUN: not %target-swift-frontend %s -typecheck
+
+func c<each This, each Argument, each Return>(_ fn: (repeat each This) -> (repeat each Argument) -> (repeat each Return)) -> (repeat each This, repeat each Argument) -> (repeat each Return) {
+  return {
+    return fn(repeat each $0)(repeat each $1)
+  }
+}