syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"panic!(\"expected"}]}
source_snippet:                 panic!("expected placeholder: {self:?}")
context_before:             CanonicalVarKind::Ty(_) | CanonicalVarKind::Region(_) | CanonicalVarKind::Const(_) => {
context_after:             }