syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"ty::Param(_)"}]}
source_snippet:         ty::Param(_) => match treat_params {
context_before:         ty::Placeholder(..) => Some(SimplifiedType::Placeholder),
context_after:             TreatParams::AsRigid => Some(SimplifiedType::Placeholder),