syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"r8:"}]}
source_snippet:         r8: reg = ["r8", "r8w", "r8d"] % x86_64_only,
context_before:         di: reg = ["di", "edi", "rdi"],
context_after:         r9: reg = ["r9", "r9w", "r9d"] % x86_64_only,