[Bug 56465] d3dcompiler fails to compile shader functions that have optional arguments ("E5000: syntax error, unexpected '=', expecting ')'")

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56465

--- Comment #2 from Gijs Vermeulen  ---
Created attachment 76769
  --> https://bugs.winehq.org/attachment.cgi?id=76769
log + shaders

It seems the Nvidia GeoForms demo (bug 43481) might require this too. I've
attached a log and the dumped shaders (compressed).