Rollup merge of #119805 - chenyukang:yukang-fix-119530, r=davidtwco

Suggest array::from_fn for array initialization

Fixes #119530

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -3152,6 +3152,10 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                         ],
                         Applicability::MachineApplicable,
                     );
+                } else {
+                    // FIXME: we may suggest array::repeat instead
+                    err.help("consider using `core::array::from_fn` to initialize the array");
+                    err.help("see https://doc.rust-lang.org/stable/std/array/fn.from_fn.html# for more information");
                 }
 
                 if self.tcx.sess.is_nightly_build()