syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"di:"}]}
source_snippet:         di: reg = ["di", "edi", "rdi"],
context_before:         si: reg = ["si", "esi", "rsi"] % esi_reserved,
context_after:         r8: reg = ["r8", "r8w", "r8d"] % x86_64_only,