[Bug 95005] Unreal engine demos segfault after shader compilation error with OpenGL 4.3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95005

            Bug ID: 95005
           Summary: Unreal engine demos segfault after shader compilation
                    error with OpenGL 4.3
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: glsl-compiler
          Assignee: idr at freedesktop.org
          Reporter: bas at basnieuwenhuizen.nl
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 123034
  --> https://bugs.freedesktop.org/attachment.cgi?id=123034&action=edit
Shader

The attached shader is used by the Elemental Demo, extracted with apitrace. It
gets the following compilation error:

0:9(31): error: struct 'TEXCOORD0' previously defined

After some discussion on #dri-devel, we think this is invalid GLSL. 

However, given the large number of games using the engine we might still want
to support it. (TODO: is it really the engine or just multiple demos?)

I think adding a drirc quick is going to be infeasible given that the engine
seems to be used by many games.

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