Function lemma_disjoint_preceded_left 

pub broadcast proof fn lemma_disjoint_preceded_left<U1: SpecParser, V1: SpecParser, U: SpecParser, const CHECK: bool>(
    preceded: Preceded<U1, U1::PVal, V1, CHECK>,
    other: U,
)

requires

disjoint_domains(preceded.a, other),

ensures

#[trigger] disjoint_domains(preceded, other),

A Preceded parser is disjoint from another parser if its prefix is.