syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // We only mangle a typed value if the const can be evaluated.
context_before:     fn print_const(&mut self, ct: ty::Const<'tcx>) -> Result<(), PrintError> {
context_after:         let cv = match ct.kind() {