syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// and paren expressions have no category.
context_before:     /// Determines the category for a given expression. Note that scope
context_after:     pub(crate) fn of(ek: &ExprKind<'_>) -> Option<Category> {