syntax_data: {"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"Self::xmm_reg"}]}
source_snippet:             Self::xmm_reg => types! {
context_before:             Self::reg_byte => types! { _: I8; },
context_after:                 sse: I32, I64, F16, F32, F64, F128,