Function lemma_cond_spec_parse_congruence 

pub proof fn lemma_cond_spec_parse_congruence<Inner1: SpecParser, Inner2: SpecParser<PVal = Inner1::PVal>>(
    cond: bool,
    inner1: Inner1,
    inner2: Inner2,
)

requires

forall |x: Seq<u8>| #[trigger] inner1.spec_parse(x) == inner2.spec_parse(x),

ensures

forall |x: Seq<u8>| {
    #[trigger] Cond(cond, inner1).spec_parse(x) == Cond(cond, inner2).spec_parse(x)
},