From b0de80f07efb9e6f1ddde1f7e2b471a47f9ec212 Mon Sep 17 00:00:00 2001
From: Andy Hanson <anhans@microsoft.com>
Date: Wed, 24 May 2017 08:14:52 -0700
Subject: [PATCH] Set '.declarations' on a property of a homomorphic mapped
 type

---
 src/compiler/checker.ts                       |  1 +
 .../server/quickInfoMappedSpreadTypes.ts      | 30 +++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 tests/cases/fourslash/server/quickInfoMappedSpreadTypes.ts

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index ce982a113f2..e3aedd5fe51 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -5690,6 +5690,7 @@ namespace ts {
                     prop.type = propType;
                     if (propertySymbol) {
                         prop.syntheticOrigin = propertySymbol;
+                        prop.declarations = propertySymbol.declarations;
                     }
                     members.set(propName, prop);
                 }
diff --git a/tests/cases/fourslash/server/quickInfoMappedSpreadTypes.ts b/tests/cases/fourslash/server/quickInfoMappedSpreadTypes.ts
new file mode 100644
index 00000000000..2a0c1668763
--- /dev/null
+++ b/tests/cases/fourslash/server/quickInfoMappedSpreadTypes.ts
@@ -0,0 +1,30 @@
+/// <reference path="../fourslash.ts"/>
+
+////interface Foo {
+////    /** Doc */
+////    bar: number;
+////}
+////
+////const f: Foo = { bar: 0 };
+////f./*f*/bar;
+////
+////const f2: { [TKey in keyof Foo]: string } = { bar: "0" };
+////f2./*f2*/bar;
+////
+////const f3 = { ...f };
+////f3./*f3*/bar;
+////
+////const f4 = { ...f2 };
+////f4./*f4*/bar;
+
+goTo.marker("f");
+verify.quickInfoIs("(property) Foo.bar: number", "Doc ");
+
+goTo.marker("f2");
+verify.quickInfoIs("(property) bar: string", "Doc ");
+
+goTo.marker("f3");
+verify.quickInfoIs("(property) Foo.bar: number", "Doc ");
+
+goTo.marker("f4");
+verify.quickInfoIs("(property) bar: string", "Doc ");