def some_inj

bend-collections-laws-crypto@1.0.0.0 · proofs/lib/logic.bend:92

import Base

92def some_inj(-A: Data, x: A, y: A, e: {Some{x} == Some{y} : Maybe<&2, A>}) -> {x == y : A}:
93  Equal.cong(Maybe<&2, A>, A, m => some_value(A, m, x), Some{x}, Some{y}, e)