bgfx/3rdparty/glsl-optimizer/tests/vertex/opt-unusedvars-in.txt

uniform mat4 mvp;
uniform mat4 unusedMatrix;
uniform float unusedFloat;
attribute vec4 myColor;
attribute vec3 myUnused;

void main() {
	gl_Position = mvp * gl_Vertex;
	gl_FrontColor = myColor;
}