init commit

test/parse/struct_field_access_test.golden

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+(program	
+ (struct Vertex_Out
+  [(:= position float3 (@position)) 
+   (:= normal float3 (@normal)) 
+   (:= uv float3 (@uv)) 
+   (:= frag_pos float3 (@interp))])
+
+ (instance
+  [(:= model float4x4 (@model))])
+
+ (fun vertex main
+  [(:= position float3 (@position)) 
+   (:= uv float2 (@uv)) 
+   (:= normal float3 (@normal))] 
+  (:= v_out Vertex_Out) 
+  (= v_out.position (mul position model)) 
+  (= v_out.normal normal) 
+  (= v_out.uv uv) 
+  (= v_out.frag_pos position) 
+  (return v_out))
+
+ (struct Pixel_Out
+  [(:= color float4 (@target0)) 
+   (:= emission float4 (@target1))])
+
+ (fun pixel main
+  [(:= v_in Vertex_Out)] 
+  (:= p_out Pixel_Out) 
+  (= p_out.color (float4 1 0.5 1 1)) 
+  (= p_out.emission (float4 2 2 2 2)) 
+  (return p_out)))