syntax_data: {"ast_node_type":"other","tokens":[{"end":33,"kind":"keyword","start":0,"text":"ymm0:"}]}
source_snippet:         ymm0: ymm_reg = ["ymm0"],
context_before:         xmm15: xmm_reg = ["xmm15"] % x86_64_only,
context_after:         ymm1: ymm_reg = ["ymm1"],