Use extension trait derive

compiler/rustc_trait_selection/src/traits/query/normalize.rs

@@ -22,20 +22,8 @@ use super::NoSolution;
 
 pub use rustc_middle::traits::query::NormalizationResult;
 
-pub trait QueryNormalizeExt<'tcx> {
-    /// Normalize a value using the `QueryNormalizer`.
-    ///
-    /// This normalization should *only* be used when the projection does not
-    /// have possible ambiguity or may not be well-formed.
-    ///
-    /// After codegen, when lifetimes do not matter, it is preferable to instead
-    /// use [`TyCtxt::normalize_erasing_regions`], which wraps this procedure.
-    fn query_normalize<T>(self, value: T) -> Result<Normalized<'tcx, T>, NoSolution>
-    where
-        T: TypeFoldable<TyCtxt<'tcx>>;
-}
-
-impl<'cx, 'tcx> QueryNormalizeExt<'tcx> for At<'cx, 'tcx> {
+#[extension]
+pub impl<'cx, 'tcx> QueryNormalizeExt<'tcx> for At<'cx, 'tcx> {
     /// Normalize `value` in the context of the inference context,
     /// yielding a resulting type, or an error if `value` cannot be
     /// normalized. If you don't care about regions, you should prefer