anchor.diff:      }
     }
   
  -  void compileShaders() {
  +  bool compileShaders() {
       // Compile vertex shader.
       int vshader = glCreateShader(GL_VERTEX_SHADER);
       glShaderSource(vshader, 1, [vertexShader], null);
  
positive.code:     }
  
      if (shaderState == 1) {
        compileShaders();
        shaderState = 2;
      }
  
  
negative.code:   /// Fragment shader editor
    fl.TextEditor editor;
  
    /// Status box
    fl.Box status;
  
    /// Text buffer for the editor
    fl.TextBuffer buffer;
  