PLN typed a TODO comment into the middle of `d12 $ gF3 $ gM3`, landing the `3`
after the `--`. The line became `d12 $ gF3 $ gM`, and `gM` does not exist:

    Variable not in scope: gM :: Pattern ValueMap -> Pattern ValueMap
    Perhaps use one of these: 'gM1', 'gM2', 'gM3'

One parse error silences the WHOLE do-block, so this was not 'd12 is quiet' —
it was 'do_it_right makes no sound at all', found by silent-eval --seeded while
he was mid-run. Comment moved above the line, where it cannot swallow code.

The TODO itself is preserved verbatim: he wants more of ^18/^19 on this lead.