#version 300 es

[require]
GL ES >= 2.0
GLSL ES >= 3.00

[vertex shader]

uniform float a;

void main(void)
{
        gl_Position = vec4(a);
}

[fragment shader]

precision mediump float;
precision mediump int;

layout(location = 0) out vec4 colour;

vec4 getColour() {

  for(int v124 = 0; v124 != 1; v124++ ) {
    for(int v229 = 1; v229 > 0; v229-- ) { 
      return vec4(1.0, 1.0, 1.0, 1.0);
    }
  }
}

void main(void) {
  colour = getColour();
}

[test]
link success