Function rustc_query_system::query::plumbing::ensure_query_impl

pub(in query::plumbing) fn ensure_query_impl<CTX, C>(
    tcx: CTX, 
    state: &QueryState<CTX::DepKind, CTX::Query, C>, 
    key: C::Key, 
    query: &QueryVtable<CTX, C::Key, C::Value>
) where
    C: QueryCache,
    C::Key: DepNodeParams<CTX>,
    CTX: QueryContext, 

Ensure that either this query has all green inputs or been executed. Executing query::ensure(D) is considered a read of the dep-node D.

This function is particularly useful when executing passes for their side-effects -- e.g., in order to report errors for erroneous programs.

Note: The optimization is only available during incr. comp.