hoist imports

fixes webpack#2528

lib/Parser.js

@@ -371,8 +371,21 @@ Parser.prototype.walkMethodDefinition = function walkMethodDefinition(methodDefi
 
 Parser.prototype.walkStatements = function walkStatements(statements) {
 	statements.forEach(function(statement) {
-		this.walkStatement(statement);
+		if(this.isHoistedStatement(statement))
+			this.walkStatement(statement);
 	}, this);
+	statements.forEach(function(statement) {
+		if(!this.isHoistedStatement(statement))
+			this.walkStatement(statement);
+	}, this);
+};
+
+Parser.prototype.isHoistedStatement = function isHoistedStatement(statement) {
+	switch(statement.type) {
+		case "ImportDeclaration":
+			return true;
+	}
+	return false;
 };
 
 Parser.prototype.walkStatement = function walkStatement(statement) {

test/cases/parsing/harmony-spec/index.js

@@ -1,6 +1,5 @@
 import { value, add } from "./live";
 import { value as value2, add as add2 } from "./live-es5";
-import { value as valueEval, evalInModule } from "./eval";
 import { getLog } from "./order-tracker";
 import "./order-c";
 import cycleValue from "./export-cycle-a";
@@ -29,4 +28,6 @@ it("should execute modules in the correct order", function() {
 
 it("should bind exports before the module executes", function() {
 	cycleValue.should.be.eql(true);
-});
+});
+
+import { value as valueEval, evalInModule } from "./eval";

test/cases/parsing/issue-2528-2/index.js

@@ -0,0 +1,3 @@
+foo();
+
+import { foo } from './module';

test/cases/parsing/issue-2528-2/module.js

@@ -0,0 +1,3 @@
+export function foo() {
+	it("should run", function() {});
+}