syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"r20:"}]}
source_snippet:         r20: reg, reg_nonzero = ["r20", "20"],
context_before:         r19: reg, reg_nonzero = ["r19", "19"],
context_after:         r21: reg, reg_nonzero = ["r21", "21"],