message: polish(compiler): remove the extra space of v-for alias
diff: @@ -375,7 +375,7 @@ export function parseFor (exp: string): ?ForParseResult {
  const alias = inMatch[1].trim().replace(stripParensRE, '')
  const iteratorMatch = alias.match(forIteratorRE)
  if (iteratorMatch) {
  - res.alias = alias.replace(forIteratorRE, '')
  + res.alias = alias.replace(forIteratorRE, '').trim()
  res.iterator1 = iteratorMatch[1].trim()
  if (iteratorMatch[2]) {
  res.iterator2 = iteratorMatch[2].trim()
  