don't error on value named super outside class

Author: leafo

moonscript/compile/value.lua

@@ -309,8 +309,9 @@ value_compile = {
     return "self:" .. self:value(node[2])
   end,
   raw_value = function(self, value)
-    if value == "super" then
-      return self:value(self:get("super")(self))
+    local sup = self:get("super")
+    if value == "super" and sup then
+      return self:value(sup(self))
     end
     if value == "..." then
       self.has_varargs = true

moonscript/compile/value.moon

@@ -181,8 +181,9 @@ value_compile =
 
   -- catch all pure string values
   raw_value: (value) =>
-    if value == "super"
-      return @value @get"super" self
+    sup = @get"super"
+    if value == "super" and sup
+      return @value sup self
 
     if value == "..."
       @has_varargs = true