syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"Self::xmm_reg"}]}
source_snippet:             Self::xmm_reg | Self::ymm_reg | Self::zmm_reg => &['x', 'y', 'z'],
context_before:             Self::reg_byte => &[],
context_after:             Self::kreg | Self::kreg0 => &[],