Warn about catching non-local returns.

Almost every time someone is shooting themself in the foot
by catching a non-local return, it is apparent from the
structure of the AST that they are doing so.  Warn them.

1 files changed, 7 insertions, 0 deletions

diff --git a/test/files/neg/nonlocal-warning.scala b/test/files/neg/nonlocal-warning.scala
new file mode 100644
index 0000000000..cc98bd631a
--- /dev/null
+++ b/test/files/neg/nonlocal-warning.scala
@@ -0,0 +1,7 @@
+class Foo {
+  def foo(l: List[Int]): Int = {
+    try l foreach { _ => return 5 }
+    catch { case x => 11 }
+    22
+  }
+}