From 3f83b55899c3035738a61cb0ca3ba1e74cd8b4f9 Mon Sep 17 00:00:00 2001
From: Ron Buckton <ron.buckton@microsoft.com>
Date: Thu, 8 Jun 2017 17:05:51 -0700
Subject: [PATCH] Added comments for fresh/regular unique symbol types

---
 src/compiler/checker.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index b9a167491d0..edbe017be7c 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -4537,6 +4537,10 @@ namespace ts {
                 }
 
                 // If the type is a fresh, unique symbol type and is not the type for this symbol, get its regular type
+                // For example:
+                //
+                //  const x = Symbol(); // fresh type, e.g. 'symbol()'
+                //  const y = x;        // regular type, e.g. 'typeof x'
                 if (type.flags & TypeFlags.Unique && type.flags & TypeFlags.Fresh && type.symbol !== symbol) {
                     type = (<UniqueType>type).regularType;
                 }