syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"r12:"}]}
source_snippet:         r12: reg, reg_nonzero = ["r12", "12"],
context_before:         r11: reg, reg_nonzero = ["r11", "11"],
context_after:         r13: reg, reg_nonzero = ["r13", "13"] % reserved_r13,