syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"ty::Param(_)"}]}
source_snippet:         ty::Param(_) | ty::Placeholder(..) => {
context_before:         // Types with no meaningful known layout.
context_after:             return Err(error(cx, LayoutError::TooGeneric(ty)));