syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"Self::kreg"}]}
source_snippet:             Self::kreg | Self::kreg0 => &[],
context_before:             Self::xmm_reg | Self::ymm_reg | Self::zmm_reg => &['x', 'y', 'z'],
context_after:             Self::mmx_reg | Self::x87_reg => &[],