From 98ac4e4c51a0b7b8f75d5f854a3f890be9851573 Mon Sep 17 00:00:00 2001
From: Fabian Cook <faybecook@gmail.com>
Date: Thu, 8 Sep 2016 09:21:34 +1200
Subject: [PATCH] Allow -Infinity as an enum property name

---
 src/compiler/checker.ts                               |  2 +-
 .../reference/enumWithNegativeInfinityProperty.js     | 11 +++++++++++
 .../enumWithNegativeInfinityProperty.symbols          |  7 +++++++
 .../reference/enumWithNegativeInfinityProperty.types  |  8 ++++++++
 .../compiler/enumWithNegativeInfinityProperty.ts      |  3 +++
 5 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 tests/baselines/reference/enumWithNegativeInfinityProperty.js
 create mode 100644 tests/baselines/reference/enumWithNegativeInfinityProperty.symbols
 create mode 100644 tests/baselines/reference/enumWithNegativeInfinityProperty.types
 create mode 100644 tests/cases/compiler/enumWithNegativeInfinityProperty.ts

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 3910d658edf..e2377db8f31 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -10034,7 +10034,7 @@ namespace ts {
         }
 
         function isInfinityOrNaNString(name: string) : boolean {
-            return name === 'Infinity' || name === 'NaN';
+            return name === 'Infinity' || name === '-Infinity' || name === 'NaN';
         }
 
         function isNumericLiteralName(name: string) {
diff --git a/tests/baselines/reference/enumWithNegativeInfinityProperty.js b/tests/baselines/reference/enumWithNegativeInfinityProperty.js
new file mode 100644
index 00000000000..867545fb14a
--- /dev/null
+++ b/tests/baselines/reference/enumWithNegativeInfinityProperty.js
@@ -0,0 +1,11 @@
+//// [enumWithNegativeInfinityProperty.ts]
+enum A {
+    "-Infinity" = 1
+}
+
+
+//// [enumWithNegativeInfinityProperty.js]
+var A;
+(function (A) {
+    A[A["-Infinity"] = 1] = "-Infinity";
+})(A || (A = {}));
diff --git a/tests/baselines/reference/enumWithNegativeInfinityProperty.symbols b/tests/baselines/reference/enumWithNegativeInfinityProperty.symbols
new file mode 100644
index 00000000000..51c61196ca6
--- /dev/null
+++ b/tests/baselines/reference/enumWithNegativeInfinityProperty.symbols
@@ -0,0 +1,7 @@
+=== tests/cases/compiler/enumWithNegativeInfinityProperty.ts ===
+enum A {
+>A : Symbol(A, Decl(enumWithNegativeInfinityProperty.ts, 0, 0))
+
+    "-Infinity" = 1
+}
+
diff --git a/tests/baselines/reference/enumWithNegativeInfinityProperty.types b/tests/baselines/reference/enumWithNegativeInfinityProperty.types
new file mode 100644
index 00000000000..bc09333075d
--- /dev/null
+++ b/tests/baselines/reference/enumWithNegativeInfinityProperty.types
@@ -0,0 +1,8 @@
+=== tests/cases/compiler/enumWithNegativeInfinityProperty.ts ===
+enum A {
+>A : A
+
+    "-Infinity" = 1
+>1 : number
+}
+
diff --git a/tests/cases/compiler/enumWithNegativeInfinityProperty.ts b/tests/cases/compiler/enumWithNegativeInfinityProperty.ts
new file mode 100644
index 00000000000..057c3a5e669
--- /dev/null
+++ b/tests/cases/compiler/enumWithNegativeInfinityProperty.ts
@@ -0,0 +1,3 @@
+enum A {
+    "-Infinity" = 1
+}