syntax_data: {"ast_node_type":"other","tokens":[{"end":33,"kind":"keyword","start":0,"text":"xmm7:"}]}
source_snippet:         xmm7: xmm_reg = ["xmm7"],
context_before:         xmm6: xmm_reg = ["xmm6"],
context_after:         xmm8: xmm_reg = ["xmm8"] % x86_64_only,