syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"Ok(metadata_ty)"}]}
source_snippet:                 Ok(metadata_ty) => metadata_ty,
context_before:             match pointee_ty.ptr_metadata_ty_or_tail(tcx, |x| x) {
context_after:                 Err(tail_ty) => {