def count

bolt@1.27.0.0 · src/rules/pedantic/rewalk.bend:540

import Base

540# how many lets of this name take effect before this position
541def count(bs: List<&2, Bind>, +name: String, +line: U32, +col: U32) -> U32:
542  match bs:
543    case Nil{}:
544      0
545    case Con{Bind{+nm, +l, +c}, rest}:
546      +more = count(rest, name, line, col)
547      Bool.pick(U32, Bool.and(String.eq(nm, name), before(l, c, line, col)), (more + 1 : U32), more)