@NotNull
  @Override
  public GrNamedArgument createNamedArgument(@NotNull final String name, @NotNull final GrExpression expression) {
    PsiFile file = createGroovyFileChecked("foo (" + name + ":" + expression.getText() + ")");
    assert file.getChildren()[0] != null;
    GrCall call = (GrCall)file.getChildren()[0];
    return call.getArgumentList().getNamedArguments()[0];
  }
@NotNull
  @Override
  public GrNamedArgument createNamedArgument(@NotNull final String name, @NotNull final GrExpression expression)