Fix FunctionExpression parens issues (#250)

src/fast-path.js

@@ -366,6 +366,7 @@ FPp.needsParens = function(assumeExpressionContext) {
           return n.ObjectPattern.check(node.left) && this.firstInStatement();
       }
 
+    case "FunctionExpression":
     case "ArrowFunctionExpression":
       if (parent.type === "CallExpression" && name === "callee") {
         return true;

tests/arrows/__snapshots__/jsfmt.spec.js.snap

@@ -28,11 +28,17 @@ var ident = <T>(x: T): T => x;
 exports[`test arrow_function_expression.js 1`] = `
 "(a => {}).length
 typeof (() => {});
+export default (() => {})();
+(() => {})()\`\`;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 (a => {
 }).length;
 typeof (() => {
 });
+export default (() => {
+})()
+(() => {
+})()\`\`;
 "
 `;
 

tests/arrows/arrow_function_expression.js

@@ -1,2 +1,4 @@
 (a => {}).length
 typeof (() => {});
+export default (() => {})();
+(() => {})()``;

tests/function/__snapshots__/jsfmt.spec.js.snap

@@ -351,6 +351,23 @@ var e = (d.bind(1): Function)();
 "
 `;
 
+exports[`test function_expression.js 1`] = `
+"(function() {}).length
+typeof (function() {});
+export default (function() {})();
+(function() {})()\`\`;
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+(function() {
+}).length;
+typeof (function() {
+});
+export default (function() {
+})()
+(function() {
+})()\`\`;
+"
+`;
+
 exports[`test rest.js 1`] = `
 "/* regression tests */
 

tests/function/function_expression.js

@@ -0,0 +1,4 @@
+(function() {}).length
+typeof (function() {});
+export default (function() {})();
+(function() {})()``;