syntax_data: {"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"Err(tail)"}]}
source_snippet:             Err(tail) => bug!(
context_before:             Ok(metadata) => metadata,
context_after:                 "`ptr_metadata_ty` failed to get metadata for type: {self:?} (tail = {tail:?})"