syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"r11b:"}]}
source_snippet:         r11b: reg_byte = ["r11b"] % x86_64_only,
context_before:         r10b: reg_byte = ["r10b"] % x86_64_only,
context_after:         r12b: reg_byte = ["r12b"] % x86_64_only,