syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"ymm15:"}]}
source_snippet:         ymm15: ymm_reg = ["ymm15"] % x86_64_only,
context_before:         ymm14: ymm_reg = ["ymm14"] % x86_64_only,
context_after:         zmm0: zmm_reg = ["zmm0"],