syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"r4:"}]}
source_snippet:         r4: reg, reg_nonzero = ["r4", "4"],
context_before:         r3: reg, reg_nonzero = ["r3", "3"],
context_after:         r5: reg, reg_nonzero = ["r5", "5"],