Improve variable name in IdlInterface.prototype.do_member_operation_asserts
diff --git a/resources/idlharness.js b/resources/idlharness.js
index d99601f..8f741b0 100644
--- a/resources/idlharness.js
+++ b/resources/idlharness.js
@@ -2357,13 +2357,13 @@
     assert_equals(typeof memberHolderObject[member.name], "function",
                   "property must be a function");
 
-    const ctors = this.members.filter(function(m) {
+    const operationOverloads = this.members.filter(function(m) {
         return m.type == "operation" && m.name == member.name &&
             (m.special === "static") === (member.special === "static");
     });
     assert_equals(
         memberHolderObject[member.name].length,
-        minOverloadLength(ctors),
+        minOverloadLength(operationOverloads),
         "property has wrong .length");
     assert_equals(
         memberHolderObject[member.name].name,