syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"\"PrintPerf\""}]}
source_snippet:                 "PrintPerf" => AutoDiff::PrintPerf,
context_before:                 "PrintAA" => AutoDiff::PrintAA,
context_after:                 "PrintSteps" => AutoDiff::PrintSteps,