From e45bac813954c72494ecd2cb5672ed51858c3a83 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Sat, 9 Apr 2016 17:56:03 -0700
Subject: [PATCH] Adding test

---
 .../controlFlowDestructuringDeclaration.js    | 113 ++++++++++
 ...ontrolFlowDestructuringDeclaration.symbols | 164 +++++++++++++++
 .../controlFlowDestructuringDeclaration.types | 196 ++++++++++++++++++
 .../controlFlowDestructuringDeclaration.ts    |  59 ++++++
 4 files changed, 532 insertions(+)
 create mode 100644 tests/baselines/reference/controlFlowDestructuringDeclaration.js
 create mode 100644 tests/baselines/reference/controlFlowDestructuringDeclaration.symbols
 create mode 100644 tests/baselines/reference/controlFlowDestructuringDeclaration.types
 create mode 100644 tests/cases/conformance/controlFlow/controlFlowDestructuringDeclaration.ts

diff --git a/tests/baselines/reference/controlFlowDestructuringDeclaration.js b/tests/baselines/reference/controlFlowDestructuringDeclaration.js
new file mode 100644
index 00000000000..766fb6baeb2
--- /dev/null
+++ b/tests/baselines/reference/controlFlowDestructuringDeclaration.js
@@ -0,0 +1,113 @@
+//// [controlFlowDestructuringDeclaration.ts]
+
+function f1() {
+    let x: string | number = 1;
+    x;
+    let y: string | undefined = "";
+    y;
+}
+
+function f2() {
+    let [x]: [string | number] = [1];
+    x;
+    let [y]: [string | undefined] = [""];
+    y;
+    let [z = ""]: [string | undefined] = [undefined];
+    z;
+}
+
+function f3() {
+    let [x]: (string | number)[] = [1];
+    x;
+    let [y]: (string | undefined)[] = [""];
+    y;
+    let [z = ""]: (string | undefined)[] = [undefined];
+    z;
+}
+
+function f4() {
+    let { x }: { x: string | number } = { x: 1 };
+    x;
+    let { y }: { y: string | undefined } = { y: "" };
+    y;
+    let { z = "" }: { z: string | undefined } = { z: undefined };
+    z;
+}
+
+function f5() {
+    let { x }: { x?: string | number } = { x: 1 };
+    x;
+    let { y }: { y?: string | undefined } = { y: "" };
+    y;
+    let { z = "" }: { z?: string | undefined } = { z: undefined };
+    z;
+}
+
+function f6() {
+    let { x }: { x?: string | number } = {};
+    x;
+    let { y }: { y?: string | undefined } = {};
+    y;
+    let { z = "" }: { z?: string | undefined } = {};
+    z;
+}
+
+function f7() {
+    let o: { [x: string]: number } = { x: 1 };
+    let { x }: { [x: string]: string | number } = o;
+    x;
+}
+
+
+//// [controlFlowDestructuringDeclaration.js]
+function f1() {
+    var x = 1;
+    x;
+    var y = "";
+    y;
+}
+function f2() {
+    var x = [1][0];
+    x;
+    var y = [""][0];
+    y;
+    var _a = [undefined][0], z = _a === void 0 ? "" : _a;
+    z;
+}
+function f3() {
+    var x = [1][0];
+    x;
+    var y = [""][0];
+    y;
+    var _a = [undefined][0], z = _a === void 0 ? "" : _a;
+    z;
+}
+function f4() {
+    var x = { x: 1 }.x;
+    x;
+    var y = { y: "" }.y;
+    y;
+    var _a = { z: undefined }.z, z = _a === void 0 ? "" : _a;
+    z;
+}
+function f5() {
+    var x = { x: 1 }.x;
+    x;
+    var y = { y: "" }.y;
+    y;
+    var _a = { z: undefined }.z, z = _a === void 0 ? "" : _a;
+    z;
+}
+function f6() {
+    var x = {}.x;
+    x;
+    var y = {}.y;
+    y;
+    var _a = {}.z, z = _a === void 0 ? "" : _a;
+    z;
+}
+function f7() {
+    var o = { x: 1 };
+    var x = o.x;
+    x;
+}
diff --git a/tests/baselines/reference/controlFlowDestructuringDeclaration.symbols b/tests/baselines/reference/controlFlowDestructuringDeclaration.symbols
new file mode 100644
index 00000000000..65f0e497942
--- /dev/null
+++ b/tests/baselines/reference/controlFlowDestructuringDeclaration.symbols
@@ -0,0 +1,164 @@
+=== tests/cases/conformance/controlFlow/controlFlowDestructuringDeclaration.ts ===
+
+function f1() {
+>f1 : Symbol(f1, Decl(controlFlowDestructuringDeclaration.ts, 0, 0))
+
+    let x: string | number = 1;
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 2, 7))
+
+    x;
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 2, 7))
+
+    let y: string | undefined = "";
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 4, 7))
+
+    y;
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 4, 7))
+}
+
+function f2() {
+>f2 : Symbol(f2, Decl(controlFlowDestructuringDeclaration.ts, 6, 1))
+
+    let [x]: [string | number] = [1];
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 9, 9))
+
+    x;
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 9, 9))
+
+    let [y]: [string | undefined] = [""];
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 11, 9))
+
+    y;
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 11, 9))
+
+    let [z = ""]: [string | undefined] = [undefined];
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 13, 9))
+>undefined : Symbol(undefined)
+
+    z;
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 13, 9))
+}
+
+function f3() {
+>f3 : Symbol(f3, Decl(controlFlowDestructuringDeclaration.ts, 15, 1))
+
+    let [x]: (string | number)[] = [1];
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 18, 9))
+
+    x;
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 18, 9))
+
+    let [y]: (string | undefined)[] = [""];
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 20, 9))
+
+    y;
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 20, 9))
+
+    let [z = ""]: (string | undefined)[] = [undefined];
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 22, 9))
+>undefined : Symbol(undefined)
+
+    z;
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 22, 9))
+}
+
+function f4() {
+>f4 : Symbol(f4, Decl(controlFlowDestructuringDeclaration.ts, 24, 1))
+
+    let { x }: { x: string | number } = { x: 1 };
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 27, 9))
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 27, 16))
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 27, 41))
+
+    x;
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 27, 9))
+
+    let { y }: { y: string | undefined } = { y: "" };
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 29, 9))
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 29, 16))
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 29, 44))
+
+    y;
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 29, 9))
+
+    let { z = "" }: { z: string | undefined } = { z: undefined };
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 31, 9))
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 31, 21))
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 31, 49))
+>undefined : Symbol(undefined)
+
+    z;
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 31, 9))
+}
+
+function f5() {
+>f5 : Symbol(f5, Decl(controlFlowDestructuringDeclaration.ts, 33, 1))
+
+    let { x }: { x?: string | number } = { x: 1 };
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 36, 9))
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 36, 16))
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 36, 42))
+
+    x;
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 36, 9))
+
+    let { y }: { y?: string | undefined } = { y: "" };
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 38, 9))
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 38, 16))
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 38, 45))
+
+    y;
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 38, 9))
+
+    let { z = "" }: { z?: string | undefined } = { z: undefined };
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 40, 9))
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 40, 21))
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 40, 50))
+>undefined : Symbol(undefined)
+
+    z;
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 40, 9))
+}
+
+function f6() {
+>f6 : Symbol(f6, Decl(controlFlowDestructuringDeclaration.ts, 42, 1))
+
+    let { x }: { x?: string | number } = {};
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 45, 9))
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 45, 16))
+
+    x;
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 45, 9))
+
+    let { y }: { y?: string | undefined } = {};
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 47, 9))
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 47, 16))
+
+    y;
+>y : Symbol(y, Decl(controlFlowDestructuringDeclaration.ts, 47, 9))
+
+    let { z = "" }: { z?: string | undefined } = {};
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 49, 9))
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 49, 21))
+
+    z;
+>z : Symbol(z, Decl(controlFlowDestructuringDeclaration.ts, 49, 9))
+}
+
+function f7() {
+>f7 : Symbol(f7, Decl(controlFlowDestructuringDeclaration.ts, 51, 1))
+
+    let o: { [x: string]: number } = { x: 1 };
+>o : Symbol(o, Decl(controlFlowDestructuringDeclaration.ts, 54, 7))
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 54, 14))
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 54, 38))
+
+    let { x }: { [x: string]: string | number } = o;
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 55, 9))
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 55, 18))
+>o : Symbol(o, Decl(controlFlowDestructuringDeclaration.ts, 54, 7))
+
+    x;
+>x : Symbol(x, Decl(controlFlowDestructuringDeclaration.ts, 55, 9))
+}
+
diff --git a/tests/baselines/reference/controlFlowDestructuringDeclaration.types b/tests/baselines/reference/controlFlowDestructuringDeclaration.types
new file mode 100644
index 00000000000..2e3b1f5647e
--- /dev/null
+++ b/tests/baselines/reference/controlFlowDestructuringDeclaration.types
@@ -0,0 +1,196 @@
+=== tests/cases/conformance/controlFlow/controlFlowDestructuringDeclaration.ts ===
+
+function f1() {
+>f1 : () => void
+
+    let x: string | number = 1;
+>x : string | number
+>1 : number
+
+    x;
+>x : number
+
+    let y: string | undefined = "";
+>y : string | undefined
+>"" : string
+
+    y;
+>y : string
+}
+
+function f2() {
+>f2 : () => void
+
+    let [x]: [string | number] = [1];
+>x : string | number
+>[1] : [number]
+>1 : number
+
+    x;
+>x : number
+
+    let [y]: [string | undefined] = [""];
+>y : string | undefined
+>[""] : [string]
+>"" : string
+
+    y;
+>y : string
+
+    let [z = ""]: [string | undefined] = [undefined];
+>z : string
+>"" : string
+>[undefined] : [undefined]
+>undefined : undefined
+
+    z;
+>z : string
+}
+
+function f3() {
+>f3 : () => void
+
+    let [x]: (string | number)[] = [1];
+>x : string | number
+>[1] : number[]
+>1 : number
+
+    x;
+>x : number
+
+    let [y]: (string | undefined)[] = [""];
+>y : string | undefined
+>[""] : string[]
+>"" : string
+
+    y;
+>y : string
+
+    let [z = ""]: (string | undefined)[] = [undefined];
+>z : string
+>"" : string
+>[undefined] : undefined[]
+>undefined : undefined
+
+    z;
+>z : string
+}
+
+function f4() {
+>f4 : () => void
+
+    let { x }: { x: string | number } = { x: 1 };
+>x : string | number
+>x : string | number
+>{ x: 1 } : { x: number; }
+>x : number
+>1 : number
+
+    x;
+>x : number
+
+    let { y }: { y: string | undefined } = { y: "" };
+>y : string | undefined
+>y : string | undefined
+>{ y: "" } : { y: string; }
+>y : string
+>"" : string
+
+    y;
+>y : string
+
+    let { z = "" }: { z: string | undefined } = { z: undefined };
+>z : string
+>"" : string
+>z : string | undefined
+>{ z: undefined } : { z: undefined; }
+>z : undefined
+>undefined : undefined
+
+    z;
+>z : string
+}
+
+function f5() {
+>f5 : () => void
+
+    let { x }: { x?: string | number } = { x: 1 };
+>x : string | number | undefined
+>x : string | number | undefined
+>{ x: 1 } : { x: number; }
+>x : number
+>1 : number
+
+    x;
+>x : number
+
+    let { y }: { y?: string | undefined } = { y: "" };
+>y : string | undefined
+>y : string | undefined
+>{ y: "" } : { y: string; }
+>y : string
+>"" : string
+
+    y;
+>y : string
+
+    let { z = "" }: { z?: string | undefined } = { z: undefined };
+>z : string
+>"" : string
+>z : string | undefined
+>{ z: undefined } : { z: undefined; }
+>z : undefined
+>undefined : undefined
+
+    z;
+>z : string
+}
+
+function f6() {
+>f6 : () => void
+
+    let { x }: { x?: string | number } = {};
+>x : string | number | undefined
+>x : string | number | undefined
+>{} : {}
+
+    x;
+>x : string | number | undefined
+
+    let { y }: { y?: string | undefined } = {};
+>y : string | undefined
+>y : string | undefined
+>{} : {}
+
+    y;
+>y : string | undefined
+
+    let { z = "" }: { z?: string | undefined } = {};
+>z : string
+>"" : string
+>z : string | undefined
+>{} : {}
+
+    z;
+>z : string
+}
+
+function f7() {
+>f7 : () => void
+
+    let o: { [x: string]: number } = { x: 1 };
+>o : { [x: string]: number; }
+>x : string
+>{ x: 1 } : { x: number; }
+>x : number
+>1 : number
+
+    let { x }: { [x: string]: string | number } = o;
+>x : string | number
+>x : string
+>o : { [x: string]: number; }
+
+    x;
+>x : number
+}
+
diff --git a/tests/cases/conformance/controlFlow/controlFlowDestructuringDeclaration.ts b/tests/cases/conformance/controlFlow/controlFlowDestructuringDeclaration.ts
new file mode 100644
index 00000000000..fc9c3ffb4d7
--- /dev/null
+++ b/tests/cases/conformance/controlFlow/controlFlowDestructuringDeclaration.ts
@@ -0,0 +1,59 @@
+// @strictNullChecks: true
+
+function f1() {
+    let x: string | number = 1;
+    x;
+    let y: string | undefined = "";
+    y;
+}
+
+function f2() {
+    let [x]: [string | number] = [1];
+    x;
+    let [y]: [string | undefined] = [""];
+    y;
+    let [z = ""]: [string | undefined] = [undefined];
+    z;
+}
+
+function f3() {
+    let [x]: (string | number)[] = [1];
+    x;
+    let [y]: (string | undefined)[] = [""];
+    y;
+    let [z = ""]: (string | undefined)[] = [undefined];
+    z;
+}
+
+function f4() {
+    let { x }: { x: string | number } = { x: 1 };
+    x;
+    let { y }: { y: string | undefined } = { y: "" };
+    y;
+    let { z = "" }: { z: string | undefined } = { z: undefined };
+    z;
+}
+
+function f5() {
+    let { x }: { x?: string | number } = { x: 1 };
+    x;
+    let { y }: { y?: string | undefined } = { y: "" };
+    y;
+    let { z = "" }: { z?: string | undefined } = { z: undefined };
+    z;
+}
+
+function f6() {
+    let { x }: { x?: string | number } = {};
+    x;
+    let { y }: { y?: string | undefined } = {};
+    y;
+    let { z = "" }: { z?: string | undefined } = {};
+    z;
+}
+
+function f7() {
+    let o: { [x: string]: number } = { x: 1 };
+    let { x }: { [x: string]: string | number } = o;
+    x;
+}