syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"DesugaringKind::Contract"}]}
source_snippet:             DesugaringKind::Contract => "contract check",
context_before:             DesugaringKind::BoundModifier => "trait bound modifier",
context_after:             DesugaringKind::PatTyRange => "pattern type",