From fe72aecce9aa037cebea54537a7e6f321468a30d Mon Sep 17 00:00:00 2001
From: Christopher Chedeau <vjeuxx@gmail.com>
Date: Sat, 14 Jan 2017 20:37:57 -0800
Subject: [PATCH] Fix parenthesis for UpdateExpression (#198)

```js
(this.x++).toString()
```

no longer drops the parenthesis
---
 src/fast-path.js                                         | 1 +
 tests/update_expression/__snapshots__/jsfmt.spec.js.snap | 6 ++++++
 tests/update_expression/jsfmt.spec.js                    | 1 +
 tests/update_expression/update_expression.js             | 1 +
 4 files changed, 9 insertions(+)
 create mode 100644 tests/update_expression/__snapshots__/jsfmt.spec.js.snap
 create mode 100644 tests/update_expression/jsfmt.spec.js
 create mode 100644 tests/update_expression/update_expression.js

diff --git a/src/fast-path.js b/src/fast-path.js
index 4bda096a..bcc19b50 100644
--- a/src/fast-path.js
+++ b/src/fast-path.js
@@ -228,6 +228,7 @@ FPp.needsParens = function(assumeExpressionContext) {
   }
 
   switch (node.type) {
+    case "UpdateExpression":
     case "UnaryExpression":
     case "SpreadElement":
     case "SpreadProperty":
diff --git a/tests/update_expression/__snapshots__/jsfmt.spec.js.snap b/tests/update_expression/__snapshots__/jsfmt.spec.js.snap
new file mode 100644
index 00000000..b7742680
--- /dev/null
+++ b/tests/update_expression/__snapshots__/jsfmt.spec.js.snap
@@ -0,0 +1,6 @@
+exports[`test update_expression.js 1`] = `
+"(this.x++).toString()
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+(this.x++).toString();
+"
+`;
diff --git a/tests/update_expression/jsfmt.spec.js b/tests/update_expression/jsfmt.spec.js
new file mode 100644
index 00000000..989047bc
--- /dev/null
+++ b/tests/update_expression/jsfmt.spec.js
@@ -0,0 +1 @@
+run_spec(__dirname);
diff --git a/tests/update_expression/update_expression.js b/tests/update_expression/update_expression.js
new file mode 100644
index 00000000..762c641d
--- /dev/null
+++ b/tests/update_expression/update_expression.js
@@ -0,0 +1 @@
+(this.x++).toString()