syntax_data: {"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"zmm18:"}]}
source_snippet:         zmm18: zmm_reg = ["zmm18", "xmm18", "ymm18"] % x86_64_only,
context_before:         zmm17: zmm_reg = ["zmm17", "xmm17", "ymm17"] % x86_64_only,
context_after:         zmm19: zmm_reg = ["zmm19", "xmm19", "ymm19"] % x86_64_only,