fix: Update "call" parameter to $function

See sass/sass-spec#1442
Closes 2941

src/fn_miscs.cpp

@@ -91,21 +91,21 @@ namespace Sass {
       return SASS_MEMORY_NEW(Boolean, pstate, features->find(s) != features->end());
     }
 
-    Signature call_sig = "call($name, $args...)";
+    Signature call_sig = "call($function, $args...)";
     BUILT_IN(call)
     {
-      std::string name;
-      Function* ff = Cast<Function>(env["$name"]);
-      String_Constant* ss = Cast<String_Constant>(env["$name"]);
+      std::string function;
+      Function* ff = Cast<Function>(env["$function"]);
+      String_Constant* ss = Cast<String_Constant>(env["$function"]);
 
       if (ss) {
-        name = Util::normalize_underscores(unquote(ss->value()));
+        function = Util::normalize_underscores(unquote(ss->value()));
         std::cerr << "DEPRECATION WARNING: ";
         std::cerr << "Passing a string to call() is deprecated and will be illegal" << std::endl;
-        std::cerr << "in Sass 4.0. Use call(get-function(" + quote(name) + ")) instead." << std::endl;
+        std::cerr << "in Sass 4.0. Use call(get-function(" + quote(function) + ")) instead." << std::endl;
         std::cerr << std::endl;
       } else if (ff) {
-        name = ff->name();
+        function = ff->name();
       }
 
       List_Obj arglist = SASS_MEMORY_COPY(ARG("$args", List));
@@ -135,7 +135,7 @@ namespace Sass {
           args->append(SASS_MEMORY_NEW(Argument, pstate, expr));
         }
       }
-      Function_Call_Obj func = SASS_MEMORY_NEW(Function_Call, pstate, name, args);
+      Function_Call_Obj func = SASS_MEMORY_NEW(Function_Call, pstate, function, args);
 
       Expand expand(ctx, &d_env, &selector_stack, &original_stack);
       func->via_call(true); // calc invoke is allowed