From 68ab129fac529f1ed35bbb70edcc3093e88a4fcc Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Tue, 4 Apr 2017 14:53:48 -0700
Subject: [PATCH] Add regression test

---
 .../reference/limitDeepInstantiations.errors.txt  | 15 +++++++++++++++
 .../reference/limitDeepInstantiations.js          | 12 ++++++++++++
 tests/cases/compiler/limitDeepInstantiations.ts   |  5 +++++
 3 files changed, 32 insertions(+)
 create mode 100644 tests/baselines/reference/limitDeepInstantiations.errors.txt
 create mode 100644 tests/baselines/reference/limitDeepInstantiations.js
 create mode 100644 tests/cases/compiler/limitDeepInstantiations.ts

diff --git a/tests/baselines/reference/limitDeepInstantiations.errors.txt b/tests/baselines/reference/limitDeepInstantiations.errors.txt
new file mode 100644
index 00000000000..330e5fbc8e4
--- /dev/null
+++ b/tests/baselines/reference/limitDeepInstantiations.errors.txt
@@ -0,0 +1,15 @@
+tests/cases/compiler/limitDeepInstantiations.ts(3,35): error TS2550: Generic type instantiation is excessively deep and possibly infinite.
+tests/cases/compiler/limitDeepInstantiations.ts(5,13): error TS2344: Type '"false"' does not satisfy the constraint '"true"'.
+
+
+==== tests/cases/compiler/limitDeepInstantiations.ts (2 errors) ====
+    // Repro from #14837
+    
+    type Foo<T extends "true", B> = { "true": Foo<T, Foo<T, B>> }[T];
+                                      ~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2550: Generic type instantiation is excessively deep and possibly infinite.
+    let f1: Foo<"true", {}>;
+    let f2: Foo<"false", {}>;
+                ~~~~~~~
+!!! error TS2344: Type '"false"' does not satisfy the constraint '"true"'.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/limitDeepInstantiations.js b/tests/baselines/reference/limitDeepInstantiations.js
new file mode 100644
index 00000000000..7b70cbd5956
--- /dev/null
+++ b/tests/baselines/reference/limitDeepInstantiations.js
@@ -0,0 +1,12 @@
+//// [limitDeepInstantiations.ts]
+// Repro from #14837
+
+type Foo<T extends "true", B> = { "true": Foo<T, Foo<T, B>> }[T];
+let f1: Foo<"true", {}>;
+let f2: Foo<"false", {}>;
+
+
+//// [limitDeepInstantiations.js]
+// Repro from #14837
+var f1;
+var f2;
diff --git a/tests/cases/compiler/limitDeepInstantiations.ts b/tests/cases/compiler/limitDeepInstantiations.ts
new file mode 100644
index 00000000000..f478157ecc2
--- /dev/null
+++ b/tests/cases/compiler/limitDeepInstantiations.ts
@@ -0,0 +1,5 @@
+// Repro from #14837
+
+type Foo<T extends "true", B> = { "true": Foo<T, Foo<T, B>> }[T];
+let f1: Foo<"true", {}>;
+let f2: Foo<"false", {}>;