{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"///"}]}
    /// attributes do (as in the current implementation, `implied_by` in `#[unstable]`), then this
    /// specify their implications (both `implies` and `implied_by`). If only one of the two
    /// mapping is necessary for diagnostics. When a "unnecessary feature attribute" error is