!752 concepts. concept Example { S text; // compiler output } p { concepts(); addExample([[ /tmp/tmp_982526522/main.java:726: error: cannot find symbol imageSurface.setToolTipText(str(e.getPoint())); ^ symbol: variable imageSurface 1 error ]]); addExample([[ /tmp/tmp_1308433492/main.java:31: error: local variable tf is accessed from within inner class; needs to be declared final messageBox(tf.getText() + " yourself!"); ^ 1 error ]]); } svoid addExample(S text) { uniq(Example, +text); }