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test caching opt_const_param_of on disc #74376

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Merged
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Jul 21, 2020
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test caching opt_const_param_of on disc #74376

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6 changes: 5 additions & 1 deletion src/librustc_middle/query/mod.rs
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Expand Up @@ -103,9 +103,13 @@ rustc_queries! {
/// // ^ While calling `opt_const_param_of` for other bodies returns `None`.
/// }
/// ```
// It looks like caching this query on disk actually slightly
// worsened performance in #74376.
//
// Once const generics are more prevalently used, we might want to
// consider only caching calls returning `Some`.
query opt_const_param_of(key: LocalDefId) -> Option<DefId> {
desc { |tcx| "computing the optional const parameter of `{}`", tcx.def_path_str(key.to_def_id()) }
// FIXME(#74113): consider storing this query on disk.
}

/// Records the type of every item.
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