- Select a material that uses the new Universal shader
- Select Edit...
- Click the "Show code" button for All variants

On my computer a progress bar shows up that says Compiling all shaders variants. It attempts to compile about 170.000 of them. From my calculations this operation will take at least 20 minutes and the Editor is completely blocked in the meantime. Either perform that compilation in the background on separate threads and let me use Unity in the meantime or give the users a Cancel option.