__traits(getMember) works only the second time

[Rikki Cattermole via Digitalmars-d-learn]

On 10/10/2014 8:08 p.m., andre wrote:
> Hi,
>
> by executing the example source code,
> following output is returned:
>
> Reference: Child
> false
> true
>
> At first "childStr" is not found, then it is found?
> Is this a bug?
>
> Kind regards
> André
>
> -----------------
>
> module app;
>
> import test;
>
> class Child : Parent
> {
>    mixin ComponentTemplate;
>    @property string childStr(){return "";}
> }
>
> void main()
> {
>    auto child = new Child();
>    child.getParameters();
> }
>
> -----------------
>
> module test;
>
> template Params(this MyType)
> {
>    string[] Params()
>    {
>      pragma(msg, "Reference: " ~ MyType.stringof);
>      pragma(msg, is(typeof(__traits(getMember, MyType, "childStr"))));
>      pragma(msg, is(typeof(__traits(getMember, MyType, "childStr"))));
>      return [];
>    }
> }
>
> mixin template ComponentTemplate()
> {
>    private enum parameters = Params!(typeof(this));
>
>    string[] getParameters()
>    {
>      return parameters;
>    }
> }
>
> class Parent
> {
>    @property string parentStr(){return "";}
> }

Wrong trait for the job. Use hasMember instead.
Although interesting use case. Could be a bug somewhere in there.