syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"r19:"}]}
source_snippet:         r19: reg = ["r19","t3"],// feature high-register
context_before:         r18: reg = ["r18","t2"],// feature high-register
context_after:         r20: reg = ["r20","t4"],// feature high-register