syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"FnPtr(sig_tys,"}]}
source_snippet:             FnPtr(sig_tys, hdr) => write!(f, "{:?}", sig_tys.with(*hdr)),
context_before:             FnDef(d, s) => f.debug_tuple("FnDef").field(d).field(&s).finish(),
context_after:             // FIXME(unsafe_binder): print this like `unsafe<'a> T<'a>`.