syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"CanonicalVarKind::PlaceholderConst(placeholder)"}]}
source_snippet:             CanonicalVarKind::PlaceholderConst(placeholder) => placeholder.var().as_usize(),
context_before:             CanonicalVarKind::PlaceholderTy(placeholder) => placeholder.var().as_usize(),
context_after:         }