syntax_data: {"ast_node_type":"impl","tokens":[{"end":55,"kind":"keyword","start":0,"text":"DesugaringKind::OpaqueTy"}]}
source_snippet:             DesugaringKind::OpaqueTy => "`impl Trait`",
context_before:             DesugaringKind::YeetExpr => "`do yeet` expression",
context_after:             DesugaringKind::ForLoop => "`for` loop",