From 8daf98b6236bed2db074b8e8beb7e3225201b71a Mon Sep 17 00:00:00 2001
From: Michael Goulet <michael@errs.io>
Date: Sun, 13 Jul 2025 16:26:13 +0000
Subject: Imply always-const host effects the same as any other item bound

---
 .../rustc_hir_analysis/src/collect/item_bounds.rs     |  1 +
 tests/ui/traits/const-traits/imply-always-const.rs    | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 tests/ui/traits/const-traits/imply-always-const.rs

diff --git a/compiler/rustc_hir_analysis/src/collect/item_bounds.rs b/compiler/rustc_hir_analysis/src/collect/item_bounds.rs
index 7e3fb5448f6..548ba343aae 100644
--- a/compiler/rustc_hir_analysis/src/collect/item_bounds.rs
+++ b/compiler/rustc_hir_analysis/src/collect/item_bounds.rs
@@ -124,6 +124,7 @@ fn remap_gat_vars_and_recurse_into_nested_projections<'tcx>(
         ty::ClauseKind::Trait(tr) => tr.self_ty(),
         ty::ClauseKind::Projection(proj) => proj.projection_term.self_ty(),
         ty::ClauseKind::TypeOutlives(outlives) => outlives.0,
+        ty::ClauseKind::HostEffect(host) => host.self_ty(),
         _ => return None,
     };
 
diff --git a/tests/ui/traits/const-traits/imply-always-const.rs b/tests/ui/traits/const-traits/imply-always-const.rs
new file mode 100644
index 00000000000..f6cab0681ec
--- /dev/null
+++ b/tests/ui/traits/const-traits/imply-always-const.rs
@@ -0,0 +1,19 @@
+//@ check-pass
+
+#![feature(const_trait_impl)]
+
+#[const_trait]
+trait A where Self::Assoc: const B {
+    type Assoc;
+}
+
+#[const_trait]
+trait B {}
+
+fn needs_b<T: const B>() {}
+
+fn test<T: A>() {
+    needs_b::<T::Assoc>();
+}
+
+fn main() {}
-- 
cgit 1.4.1-3-g733a5