syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"r3:"}]}
source_snippet:         r3: reg, reg_nonzero = ["r3", "3"],
context_before:         r0: reg = ["r0", "0"],
context_after:         r4: reg, reg_nonzero = ["r4", "4"],