syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"ty::ExistentialPredicate::Trait(x)"}]}
source_snippet:             ty::ExistentialPredicate::Trait(x) => x.print(p)?,
context_before:         match *self {
context_after:             ty::ExistentialPredicate::Projection(x) => x.print(p)?,