{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":".canonical_var_for_region(CanonicalVarKind::PlaceholderRegion(placeholder),"}]}
                .canonical_var_for_region(CanonicalVarKind::PlaceholderRegion(placeholder), r),
            ty::RePlaceholder(placeholder) => canonicalizer