syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"r13:"}]}
source_snippet:         r13: reg, reg_nonzero = ["r13", "13"] % reserved_r13,
context_before:         r12: reg, reg_nonzero = ["r12", "12"],
context_after:         r14: reg, reg_nonzero = ["r14", "14"],