A couple new tests for broken parts of the typechecker, XFAILed.

src/test/compile-fail/bad-recv.rs

@@ -0,0 +1,5 @@
+// error-pattern: mismatched types
+
+fn main() {
+  10 <- 10;
+}

src/test/compile-fail/bad-send.rs

@@ -0,0 +1,5 @@
+// error-pattern: mismatched types
+
+fn main() {
+  10 <| 10;
+}