From 6614a63b3b0f17a1f6e54e96f2ccaf3ea3692fc5 Mon Sep 17 00:00:00 2001
From: Zachary Miller <zachary.john.miller@gmail.com>
Date: Wed, 22 Feb 2017 06:50:58 -0600
Subject: [PATCH] Wrap some generated do expressions in parens (#5339)

---
 packages/babel-generator/src/node/parentheses.js              | 4 ++++
 .../test/fixtures/parentheses/do-expression/actual.js         | 3 +++
 .../test/fixtures/parentheses/do-expression/expected.js       | 3 +++
 3 files changed, 10 insertions(+)
 create mode 100644 packages/babel-generator/test/fixtures/parentheses/do-expression/actual.js
 create mode 100644 packages/babel-generator/test/fixtures/parentheses/do-expression/expected.js

diff --git a/packages/babel-generator/src/node/parentheses.js b/packages/babel-generator/src/node/parentheses.js
index 558bceb14c..948198f7cb 100644
--- a/packages/babel-generator/src/node/parentheses.js
+++ b/packages/babel-generator/src/node/parentheses.js
@@ -46,6 +46,10 @@ export function ObjectExpression(node: Object, parent: Object, printStack: Array
   return isFirstInStatement(printStack, { considerArrow: true });
 }
 
+export function DoExpression(node: Object, parent: Object, printStack: Array<Object>): boolean {
+  return isFirstInStatement(printStack);
+}
+
 export function Binary(node: Object, parent: Object): boolean {
   if ((t.isCallExpression(parent) || t.isNewExpression(parent)) && parent.callee === node) {
     return true;
diff --git a/packages/babel-generator/test/fixtures/parentheses/do-expression/actual.js b/packages/babel-generator/test/fixtures/parentheses/do-expression/actual.js
new file mode 100644
index 0000000000..21177fdcef
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/parentheses/do-expression/actual.js
@@ -0,0 +1,3 @@
+(do {
+  foo;
+});
diff --git a/packages/babel-generator/test/fixtures/parentheses/do-expression/expected.js b/packages/babel-generator/test/fixtures/parentheses/do-expression/expected.js
new file mode 100644
index 0000000000..21177fdcef
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/parentheses/do-expression/expected.js
@@ -0,0 +1,3 @@
+(do {
+  foo;
+});