syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"BackendRepr::Scalar(scalar)"}]}
source_snippet:         BackendRepr::Scalar(scalar) => match scalar.primitive() {
context_before:     match ret.layout.field(cx, i).backend_repr {
context_after:             Primitive::Float(Float::F32) => Some(Reg::f32()),