syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"r28:"}]}
source_snippet:         r28: reg = ["r28", "i4"], // % reserved_i4
context_before:         r27: reg = ["r27", "i3"], // % reserved_i3
context_after:         r29: reg = ["r29", "i5"], // % reserved_i5