syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"\"PrintModBefore\""}]}
source_snippet:                 "PrintModBefore" => AutoDiff::PrintModBefore,
context_before:                 "PrintSteps" => AutoDiff::PrintSteps,
context_after:                 "PrintModAfter" => AutoDiff::PrintModAfter,