syntax_data: {"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"BackendRepr::ScalarPair(..)"}]}
source_snippet:         BackendRepr::ScalarPair(..) | BackendRepr::Memory { .. } => match arg_layout.fields {
context_before:         BackendRepr::SimdVector { .. } => return Err(CannotUseFpConv),
context_after:             FieldsShape::Primitive => {