001-use-undefined-then-define.vert revision 01e04c3f 
1#version 130
2
3void main()
4{
5  float foo;
6  float undefinedThenDefined;
7
8  foo = undefinedThenDefined;
9  undefinedThenDefined = 2.0;
10  foo = undefinedThenDefined;
11}
12
13