gistfile1.txt

// Ran with MESA_GLSL=dump, "Mesa 11.0.0-devel (git-1bba29e) is supported"
vec4 r = vec4(1.0, 2.0, 3.0, 4.0);
gl_Position  = r;

(assign  (xyzw) (var_ref gl_Position)  (constant vec4 (1.000000 2.000000 3.000000 4.000000)) ) 

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// Ran with MESA_GLSL=dump, "Mesa 11.0.0-devel (git-1bba29e) is supported"
vec4 r;
r.x = 1.0;
r.y = 2.0;
r.z = 3.0;
r.w = 4.0;
gl_Position  = r;

(declare () vec4 r)
(assign  (x) (var_ref r)  (constant float (1.000000)) ) 
(assign  (y) (var_ref r)  (constant float (2.000000)) ) 
(assign  (z) (var_ref r)  (constant float (3.000000)) ) 
(assign  (w) (var_ref r)  (constant float (4.000000)) ) 
(assign  (xyzw) (var_ref gl_Position)  (var_ref r) )