fix dynamic attributes

compiler/generate/index.js

@@ -174,7 +174,7 @@ export default function generate ( parsed, template ) {
 											return JSON.stringify( chunk.data );
 										} else {
 											contextualise( code, chunk.expression, current.contexts, helpers );
-											return `[✂${chunk.expression.start}-${chunk.expression.end}✂]`;
+											return `( [✂${chunk.expression.start}-${chunk.expression.end}✂] )`;
 										}
 									}).join( ' + ' )
 								);

test/compiler/attribute-dynamic-multiple/_config.js

@@ -0,0 +1,10 @@
+export default {
+	data: {
+		items: [
+			{ foo: true,  bar: false },
+			{ foo: false, bar: true  },
+			{ foo: true,  bar: true  }
+		]
+	},
+	html: `<div class="foo ">1</div><div class=" bar">2</div><div class="foo bar">3</div><!--#each items-->`
+};

test/compiler/attribute-dynamic-multiple/main.svelte

@@ -0,0 +1,3 @@
+{{#each items as item, i}}
+	<div class='{{item.foo ? "foo" : ""}} {{item.bar ? "bar" : ""}}'>{{i + 1}}</div>
+{{/each}}