new mrb_get_args specifier "n" to retrieve a symbol (stands for "name")

src/class.c

@@ -370,6 +370,7 @@ to_hash(mrb_state *mrb, mrb_value val)
    a: Array [mrb_value*,int]
    f: Float [mrb_float]
    i: Integer [mrb_int]
+   n: Symbol [mrb_sym]
    &: Block [mrb_value]
    *: rest argument [mrb_value*,int]
    |: optional
@@ -560,6 +561,25 @@ mrb_get_args(mrb_state *mrb, const char *format, ...)
 	}
       }
       break;
+    case 'n':
+      {
+	mrb_sym *symp;
+
+	symp = va_arg(ap, mrb_sym*);
+	if (i < argc) {
+	  mrb_value ss;
+
+	  ss = *sp++;
+	  if (mrb_type(ss) == MRB_TT_SYMBOL) {
+	    *symp = mrb_symbol(ss);
+	  }
+	  else {
+	    *symp = mrb_intern_str(mrb, to_str(mrb, ss));
+	  }
+	  i++;
+	}
+      }
+      break;
 
     case '&':
       {