adjacent-overload-signatures false positive with symbol names

[janslow]

Bug Report

• TSLint version: 4.0.2
• TypeScript version: 2.0.10
• Running TSLint via: CLI

TypeScript code being linted

class Foo {
  readonly [Symbol.toStringTag] = 'Foo';

  bar() {
    throw new Error();
  }

  [Symbol.iterator]() {
    throw new Error();
  }
}

with tslint.json configuration:

{
  "rules": {
    "adjacent-overload-signatures": true
  }
}

Actual behavior

The adjacent-overload-signatures rule appears to coerce method names which are symbols (e.g., Symbol.iterator) into the "undefined", so it can't thinks they are overloads instead of separate methods.

src/test.ts[8, 3]: All 'undefined' signatures should be adjacent

Expected behavior

The rule should not raise an error, as they are separate methods, not overloads.