syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"Primitive::Float(Float::F64)"}]}
source_snippet:             Primitive::Float(Float::F64) => Some(Reg::f64()),
context_before:             Primitive::Float(Float::F32) => Some(Reg::f32()),
context_after:             _ => None,