def read.if
import bend-kit-bits@0.1.0.1/bits.bend as Bitsimport Base
63def read.if(ok: Bool, +msb: Bool, +len: U32, buf: Array<U32>, +pos: U32, +n: U32) -> Reader & Maybe<&2, U32>:
64 match ok:
65 case True{}:
66 read.got(msb, len, pos, n, win(msb, buf, pos))
67 case False{}:
68 (Reader{len, buf, pos}, None{})