syntax_data: {"ast_node_type":"other","tokens":[{"end":13,"kind":"keyword","start":0,"text":"Mismatch,"}]}
source_snippet:     Mismatch,
context_before: pub enum TypeError<I: Interner> {
context_after:     PolarityMismatch(#[type_visitable(ignore)] ExpectedFound<ty::PredicatePolarity>),