Merge branch '1032' of https://github.com/kzc/rollup into kzc-1032

src/ast/nodes/shared/callHasEffects.js

@@ -11,7 +11,7 @@ function fnHasEffects ( fn ) {
 
 	// handle body-less arrow functions
 	const scope = fn.body.scope || fn.scope;
-	const body = fn.body.body || [ fn.body ];
+	const body = Array.isArray(fn.body.body) && fn.body.body || [ fn.body ];
 
 	for ( const node of body ) {
 		if ( node.hasEffects( scope ) ) {

test/function/braceless-arrow-function-returning-function/_config.js

@@ -0,0 +1,4 @@
+module.exports = {
+	description: 'arrow function without braces returning a function (#1032)',
+	buble: true
+};

test/function/braceless-arrow-function-returning-function/main.js

@@ -0,0 +1,7 @@
+const f = (a) => (b) => { return a * b }
+function ff (a) { return f(a) }
+assert.equal( ff(2)(3), 6 );
+
+const g = (a) => { return (b) => { return a - b } }
+function gg (a) { return g(a) }
+assert.equal( gg(2)(3), -1 );