Auto merge of #111848 - Dylan-DPC:rollup-7jqydzg, r=Dylan-DPC

Rollup of 6 pull requests

Successful merges:

 - #111501 (MIR drive-by cleanups)
 - #111609 (Mark internal functions and traits unsafe to reflect preconditions)
 - #111612 (Give better error when collecting into `&[T]`)
 - #111756 (Rename `{drop,forget}_{copy,ref}` lints to more consistent naming)
 - #111843 (move lcnr to only review types stuff)
 - #111844 (Migrate GUI colors test to original CSS color format)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 8 insertions, 0 deletions

diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs
index 88525e1b720..10bd027b684 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs
+++ b/compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs
@@ -306,6 +306,14 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                     }
                 }
             }
+
+            // `&[{integral}]` - `FromIterator` needs that.
+            if let ty::Ref(_, ref_ty, rustc_ast::Mutability::Not) = self_ty.kind()
+                && let ty::Slice(sty) = ref_ty.kind()
+                && sty.is_integral()
+            {
+                flags.push((sym::_Self, Some("&[{integral}]".to_owned())));
+            }
         });
 
         if let Ok(Some(command)) = OnUnimplementedDirective::of_item(self.tcx, def_id) {