// b.sx authors its OWN `bump` adding 100. `from_b`'s `v.bump()` must dispatch
// b.sx's author (+100 → 110), not the first-wins winner from a.sx (+1).
bump   :: ufcs (x: s64) -> s64 { return x + 100; }
from_b_ufcs :: () -> s64 { v : s64 = 10; return v.bump(); }