syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"data.arg_attribute"}]}
source_snippet:         data.arg_attribute = ArgAttribute::InReg;
context_before:     if scalar.primitive() == Primitive::Float(Float::F32) {
context_after:         data.prefix[data.prefix_index] = Some(Reg::f32());