Add error for non existing function with keyword arguments

Author: mgreter

src/debugger.hpp

@@ -424,6 +424,9 @@ inline void debug_ast(AST_Node* node, std::string ind = "", Env* env = 0)
     std::cerr << ind << "Arguments " << expression;
     if (expression->is_delayed()) std::cerr << " [delayed]";
     std::cerr << " (" << pstate_source_position(node) << ")";
+    if (expression->has_named_arguments()) std::cerr << " [has_named_arguments]";
+    if (expression->has_rest_argument()) std::cerr << " [has_rest_argument]";
+    if (expression->has_keyword_argument()) std::cerr << " [has_keyword_argument]";
     std::cerr << std::endl;
     for(auto i : expression->elements()) { debug_ast(i, ind + " ", env); }
   } else if (dynamic_cast<Argument*>(node)) {

src/eval.cpp

@@ -605,8 +605,11 @@ namespace Sass {
                                                          c->name(),
                                                          args);
         To_String to_string(&ctx);
+        if (args->has_named_arguments()) {
+          error("Function " + c->name() + " doesn't support keyword arguments", c->pstate());
+        }
         return new (ctx.mem) String_Quoted(c->pstate(),
-                                             lit->perform(&to_string));
+                                           lit->perform(&to_string));
       } else {
         // call generic function
         full_name = "*[f]";