syntax_data: {"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"zmm19:"}]}
source_snippet:         zmm19: zmm_reg = ["zmm19", "xmm19", "ymm19"] % x86_64_only,
context_before:         zmm18: zmm_reg = ["zmm18", "xmm18", "ymm18"] % x86_64_only,
context_after:         zmm20: zmm_reg = ["zmm20", "xmm20", "ymm20"] % x86_64_only,