Function rustc_query_system::query::get_query

pub fn get_query<Q, CTX>(
    tcx: CTX, 
    span: Span, 
    key: Q::Key, 
    lookup: QueryLookup, 
    mode: QueryMode
) -> Option<Q::Stored> where
    Q: QueryDescription<CTX>,
    Q::Key: DepNodeParams<CTX::DepContext>,
    CTX: QueryContext,