syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"r20:"}]}
source_snippet:         r20: reg = ["r20", "l4"], // % reserved_l4
context_before:         r19: reg = ["r19", "l3"], // % reserved_l3
context_after:         r21: reg = ["r21", "l5"], // % reserved_l5