add crate-local `-Z reference_niches` unstable flag (does nothing for now)

2 files changed, 6 insertions, 0 deletions

diff --git a/compiler/rustc_middle/src/query/erase.rs b/compiler/rustc_middle/src/query/erase.rs
index a0cb23b5a4c..9bf02267005 100644
--- a/compiler/rustc_middle/src/query/erase.rs
+++ b/compiler/rustc_middle/src/query/erase.rs
@@ -296,6 +296,7 @@ trivial! {
     rustc_span::Symbol,
     rustc_span::symbol::Ident,
     rustc_target::spec::PanicStrategy,
+    rustc_target::abi::ReferenceNichePolicy,
     rustc_type_ir::Variance,
     u32,
     usize,
diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index c728cc0b39f..51409f90843 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -1480,6 +1480,11 @@ rustc_queries! {
         desc { "getting a crate's configured panic-in-drop strategy" }
         separate_provide_extern
     }
+    query reference_niches_policy(_: CrateNum) -> abi::ReferenceNichePolicy {
+        fatal_cycle
+        desc { "getting a crate's policy for size and alignment niches of references" }
+        separate_provide_extern
+    }
     query is_no_builtins(_: CrateNum) -> bool {
         fatal_cycle
         desc { "getting whether a crate has `#![no_builtins]`" }