syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"ty::BoundConstness::Const"}]}
source_snippet:             ty::BoundConstness::Const => write!(self, "const ")?,
context_before:         match constness {
context_after:             ty::BoundConstness::Maybe => write!(self, "[const] ")?,