syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                 if trait_pred.polarity == ty::PredicatePolarity::Negative {
context_before:             self.wrap_binder(&trait_pred, WrapBinderMode::ForAll, |trait_pred, p| {
context_after:                     write!(p, "!")?;