syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"r18:"}]}
source_snippet:         r18: reg = ["r18","t2"],// feature high-register
context_before:         r17: reg = ["r17","l9"],// feature high-register
context_after:         r19: reg = ["r19","t3"],// feature high-register