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add note to opt_const_param_of

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This commit is contained in:
Bastian Kauschke 2020-07-18 19:22:12 +02:00
parent 7e11379f3b
commit e8d16fdf9f
1 changed files with 5 additions and 1 deletions
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6
src/librustc_middle/query/mod.rs
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@ -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.