1 files changed, 25 insertions, 1 deletions
diff --git a/lib/output.js b/lib/output.js
index a6d0d0da..7bb27d9b 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -678,7 +678,7 @@ function OutputStream(options) {
     // same goes for an object literal, because otherwise it would be
     // interpreted as a block of code.
     function needs_parens_obj(output) {
-        return !output.has_parens() && first_in_statement(output);
+        return !output.has_parens() && first_in_statement(output, true);
     }
     PARENS(AST_Object, needs_parens_obj);
 
@@ -691,6 +691,8 @@ function OutputStream(options) {
         var p = output.parent();
             // [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ]
         return p instanceof AST_Array
+            // () => (foo, bar)
+            || p instanceof AST_Arrow && p.value === this
             // await (foo, bar)
             || p instanceof AST_Await
             // 1 + (2, 3) + 4 ==> 8
@@ -798,6 +800,9 @@ function OutputStream(options) {
         // !(a = false) → true
         if (p instanceof AST_Unary) return true;
     }
+    PARENS(AST_Arrow, function(output) {
+        return needs_parens_assign_cond(this, output);
+    });
     PARENS(AST_Assign, function(output) {
         if (needs_parens_assign_cond(this, output)) return true;
         //  v8 parser bug   =>     workaround
@@ -985,6 +990,25 @@ function OutputStream(options) {
     });
 
     /* -----[ functions ]----- */
+    DEFPRINT(AST_Arrow, function(output) {
+        var self = this;
+        if (self.argnames.length == 1 && self.argnames[0] instanceof AST_SymbolFunarg) {
+            self.argnames[0].print(output);
+        } else output.with_parens(function() {
+            self.argnames.forEach(function(arg, i) {
+                if (i) output.comma();
+                arg.print(output);
+            });
+        });
+        output.space();
+        output.print("=>");
+        output.space();
+        if (self.value) {
+            self.value.print(output);
+        } else {
+            print_braced(self, output, true);
+        }
+    });
     function print_lambda(self, output) {
         if (self.name) {
             output.space();