syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"self.wrap_binder(&sig,"}]}
source_snippet:         self.wrap_binder(&sig, WrapBinderMode::ForAll, |sig, p| {
context_before:         write!(self, "impl ")?;
context_after:             write!(p, "{kind}(")?;