Remove const_in_array_rep_expr

[rust.git] / compiler / rustc_trait_selection / src / traits / error_reporting / suggestions.rs

diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
index 7f2efcdfbc647930b47df443b80582031b12286f..690591930deb9d9af28f2de778898460d20a71a1 100644 (file)
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
+++ b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
@@ -286,21 +286,32 @@ fn suggest_restriction(
         );
     } else {
         // Trivial case: `T` needs an extra bound: `T: Bound`.
-        let (sp, suggestion) = match super_traits {
-            None => predicate_constraint(
+        let (sp, suggestion) = match (
+            generics
+                .params
+                .iter()
+                .filter(
+                    |p| !matches!(p.kind, hir::GenericParamKind::Type { synthetic: Some(_), ..}),
+                )
+                .next(),
+            super_traits,
+        ) {
+            (_, None) => predicate_constraint(
                 generics,
                 trait_ref.without_const().to_predicate(tcx).to_string(),
             ),
-            Some((ident, bounds)) => match bounds {
-                [.., bound] => (
-                    bound.span().shrink_to_hi(),
-                    format!(" + {}", trait_ref.print_only_trait_path().to_string()),
-                ),
-                [] => (
-                    ident.span.shrink_to_hi(),
-                    format!(": {}", trait_ref.print_only_trait_path().to_string()),
-                ),
-            },
+            (None, Some((ident, []))) => (
+                ident.span.shrink_to_hi(),
+                format!(": {}", trait_ref.print_only_trait_path().to_string()),
+            ),
+            (_, Some((_, [.., bounds]))) => (
+                bounds.span().shrink_to_hi(),
+                format!(" + {}", trait_ref.print_only_trait_path().to_string()),
+            ),
+            (Some(_), Some((_, []))) => (
+                generics.span.shrink_to_hi(),
+                format!(": {}", trait_ref.print_only_trait_path().to_string()),
+            ),
         };
 
         err.span_suggestion_verbose(
@@ -1870,23 +1881,10 @@ fn note_obligation_cause_code<T>(
             ObligationCauseCode::Coercion { source: _, target } => {
                 err.note(&format!("required by cast to type `{}`", self.ty_to_string(target)));
             }
-            ObligationCauseCode::RepeatVec(suggest_const_in_array_repeat_expressions) => {
+            ObligationCauseCode::RepeatVec => {
                 err.note(
                     "the `Copy` trait is required because the repeated element will be copied",
                 );
-                if suggest_const_in_array_repeat_expressions {
-                    err.note(
-                        "this array initializer can be evaluated at compile-time, see issue \
-                         #49147 <https://github.com/rust-lang/rust/issues/49147> \
-                         for more information",
-                    );
-                    if tcx.sess.opts.unstable_features.is_nightly_build() {
-                        err.help(
-                            "add `#![feature(const_in_array_repeat_expressions)]` to the \
-                             crate attributes to enable",
-                        );
-                    }
-                }
             }
             ObligationCauseCode::VariableType(hir_id) => {
                 let parent_node = self.tcx.hir().get_parent_node(hir_id);