syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"TreatParams::AsRigid"}]}
source_snippet:             TreatParams::AsRigid => Some(SimplifiedType::Placeholder),
context_before:         ty::Param(_) => match treat_params {
context_after:             TreatParams::InstantiateWithInfer => None,