formats: Update to ${concat(…)} to build on current nightly ${concat(…)} replaces the removed concat_idents!() macro, but doesn’t support being used in nested repetitions for now. We can remove the gen_match!() macro once this is supported again.

from pytouhou.game.effect cimport Effect
from pytouhou.utils.interpolator cimport Interpolator

cdef class Particle(Effect):
    cdef long frame, duration
    cdef Interpolator pos_interpolator

    cpdef update(self)