syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // FIXME(unsafe_binder): print this like `unsafe<'a> T<'a>`.
context_before:             FnPtr(sig_tys, hdr) => write!(f, "{:?}", sig_tys.with(*hdr)),
context_after:             UnsafeBinder(binder) => write!(f, "{:?}", binder),