From 42c1915ad31e4ff8ecfdfedecab35cc7ca4648ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@plataformatec.com.br>
Date: Fri, 20 Jul 2012 16:09:43 +0200
Subject: [PATCH] Improve error message when calling local inside guards

---
 lib/elixir/src/elixir_translator.erl | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/elixir/src/elixir_translator.erl b/lib/elixir/src/elixir_translator.erl
index 3bcdac589c..e33846e1e4 100644
--- a/lib/elixir/src/elixir_translator.erl
+++ b/lib/elixir/src/elixir_translator.erl
@@ -442,7 +442,13 @@ translate_each({Atom, Line, Args} = Original, S) when is_atom(Atom) ->
     false ->
       case handle_partials(Line, Original, S) of
         error ->
-          Callback = fun() -> translate_local(Line, Atom, Args, S) end,
+          Callback = fun() ->
+            case S#elixir_scope.context of
+              guard -> syntax_error(Line, S#elixir_scope.file,
+                "cannot invoke local ~s/~B inside guard", [Atom, length(Args)]);
+              _ -> translate_local(Line, Atom, Args, S)
+            end
+          end,
           elixir_dispatch:dispatch_import(Line, Atom, Args, S, Callback);
         Else  -> Else
       end;