syntax_data: {"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let ty::ConstKind::Param(p) = c.kind() {
context_before:     fn fold_const(&mut self, c: I::Const) -> I::Const {
context_after:             self.const_for_param(p, c)