syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"r19:"}]}
source_snippet:         r19: reg, reg_nonzero = ["r19", "19"],
context_before:         r18: reg, reg_nonzero = ["r18", "18"],
context_after:         r20: reg, reg_nonzero = ["r20", "20"],