syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"r14b:"}]}
source_snippet:         r14b: reg_byte = ["r14b"] % x86_64_only,
context_before:         r13b: reg_byte = ["r13b"] % x86_64_only,
context_after:         r15b: reg_byte = ["r15b"] % x86_64_only,