BoxMenu.lua's release() pushes both its "Once released...OK?" prompt
and its Yellow-only "Pikachu looks unhappy" message through
TextBox.new(game, (t._X or Strings(...)):gsub(...)) -- gsub returns
two values (the text and a substitution count), and since the gsub
call is the last argument in the TextBox.new(...) call with nothing
after it, Lua expands both into the call: the count lands in
TextBox.new's third parameter, onDone. TextBox.lua later calls
onDone() once the box is dismissed; a number is not callable, so
every release of your own caught Pikachu in Yellow crashed --
regardless of its nickname (unlike the separate %-escape gsub bug,
this one needs no special save content, ordinary play reaches it
every time).
Fixed by wrapping the gsub call in an extra pair of parens, which
truncates it to its first return value only -- the same fix already
applied to the neighboring _OnceReleasedText/_MonWasReleasedText
lines on the (separate, unmerged) fix/route-more-messages-through-romtext
branch, where this exact bug shape was first noticed while adding a
third callsite with the same pattern.
tests/engine/pikachu_unhappy_release_crash.lua: registers a fake
Data.pokemon.PIKACHU cloned from the fixture species (ROM-free) so
the species == "PIKACHU" check can be exercised, drives the real
interactive release flow in Yellow on a mon owned by the player, and
confirms the crash. Verified failing pre-fix (exact same
"attempt to call field 'onDone' (a number value)" error) and passing
post-fix.
thibautbus