Problems reported:

parser/error_recovery/empty_await_for:2:14: Expected an identifier, but got ')'.
  await for () {}
             ^

parser/error_recovery/empty_await_for:2:14: Expected 'in' before this.
  await for () {}
             ^

parser/error_recovery/empty_await_for:2:14: Expected an identifier, but got ')'.
  await for () {}
             ^

parser/error_recovery/empty_await_for:2:14: Expected an identifier, but got ')'.
  await for () {}
             ^

beginCompilationUnit(main)
  beginMetadataStar(main)
  endMetadataStar(0)
  beginTopLevelMember(main)
    beginTopLevelMethod(, null)
      handleNoType()
      handleIdentifier(main, topLevelFunctionDeclaration)
      handleNoTypeVariables(()
      beginFormalParameters((, MemberKind.TopLevelMethod)
      endFormalParameters(0, (, ), MemberKind.TopLevelMethod)
      handleAsyncModifier(async, null)
      beginBlockFunctionBody({)
        beginForStatement(for)
          handleRecoverableError(Message[ExpectedIdentifier, Expected an identifier, but got ')'., Try inserting an identifier before ')'., {lexeme: )}], ), ))
          handleIdentifier(, expression)
          handleNoTypeArguments())
          handleNoArguments())
          handleSend(, ))
          handleForInitializerExpressionStatement(, true)
          handleRecoverableError(Message[ExpectedButGot, Expected 'in' before this., null, {string: in}], ), ))
          handleRecoverableError(Message[ExpectedIdentifier, Expected an identifier, but got ')'., Try inserting an identifier before ')'., {lexeme: )}], ), ))
          beginForInExpression())
            handleRecoverableError(Message[ExpectedIdentifier, Expected an identifier, but got ')'., Try inserting an identifier before ')'., {lexeme: )}], ), ))
            handleIdentifier(, expression)
            handleNoTypeArguments())
            handleNoArguments())
            handleSend(, ))
          endForInExpression())
          handleForInLoopParts(await, for, (, in)
          beginForInBody({)
            beginBlock({, BlockKind(statement))
            endBlock(0, {, }, BlockKind(statement))
          endForInBody(})
        endForIn(})
      endBlockFunctionBody(1, {, })
    endTopLevelMethod(main, null, })
  endTopLevelDeclaration()
endCompilationUnit(1, )