rational.c: add argument type check assertions in f_muldiv

* rational.c (f_muldiv): add assertions to check argument types

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56724 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

rational.c

@@ -809,6 +809,12 @@ f_muldiv(VALUE self, VALUE anum, VALUE aden, VALUE bnum, VALUE bden, int k)
 {
     VALUE num, den;
 
+    assert(RB_TYPE_P(self, T_RATIONAL));
+    assert(RB_INTEGER_TYPE_P(anum));
+    assert(RB_INTEGER_TYPE_P(aden));
+    assert(RB_INTEGER_TYPE_P(bnum));
+    assert(RB_INTEGER_TYPE_P(bden));
+
     if (k == '/') {
 	VALUE t;