def internal_fin_head

bend-mathlib@0.8.1.0 · string.bend:259

import Base
import bend-mathlib@0.8.1.0/bool.bend as MBool

259def internal_fin_head(ab: Bool, bb: Bool, c: Cmp, h: {Cmp.is_eq(Word.cmp.fin(ab, bb, c)) == True{} : Bool}) -> {ab == bb : Bool}:
260  match c:
261    case LT{}:
262      Empty.absurd({ab == bb : Bool}, internal_false_ne_true(h))
263    case EQ{}:
264      MBool.eq_of_cmp_eq(ab, bb, h)
265    case GT{}:
266      Empty.absurd({ab == bb : Bool}, internal_false_ne_true(h))