syntax_data: {"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"zmm16:"}]}
source_snippet:         zmm16: zmm_reg = ["zmm16", "xmm16", "ymm16"] % x86_64_only,
context_before:         zmm15: zmm_reg = ["zmm15"] % x86_64_only,
context_after:         zmm17: zmm_reg = ["zmm17", "xmm17", "ymm17"] % x86_64_only,