Restrict const-anon exception diag to relevant places

Author: Urgau

compiler/rustc_lint/messages.ftl

@@ -549,7 +549,7 @@ lint_non_local_definitions_impl = non-local `impl` definition, `impl` blocks sho
            *[other] `{$body_name}` and up {$depth} bodies
         }
     .non_local = an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-    .exception = one exception to the rule are anon-const (`const _: () = {"{"} ... {"}"}`) at top-level module and anon-const at the same nesting as the trait or type
+    .exception = anon-const (`const _: () = {"{"} ... {"}"}`) at top-level module and anon-const at the same nesting as the trait or type are consider to be transparent regarding the nesting level
     .const_anon = use a const-anon item to suppress this lint
 
 lint_non_local_definitions_macro_rules = non-local `macro_rules!` definition, `#[macro_export]` macro should be written at top level module

compiler/rustc_lint/src/lints.rs

@@ -1346,7 +1346,7 @@ pub enum NonLocalDefinitionsDiag {
         body_kind_descr: &'static str,
         body_name: String,
         cargo_update: Option<NonLocalDefinitionsCargoUpdateNote>,
-        const_anon: Option<Span>,
+        const_anon: Option<Option<Span>>,
     },
     MacroRules {
         depth: u32,
@@ -1374,20 +1374,23 @@ impl<'a> LintDiagnostic<'a, ()> for NonLocalDefinitionsDiag {
 
                 diag.help(fluent::lint_help);
                 diag.note(fluent::lint_non_local);
-                diag.note(fluent::lint_exception);
-                diag.note(fluent::lint_non_local_definitions_deprecation);
 
                 if let Some(cargo_update) = cargo_update {
                     diag.subdiagnostic(&diag.dcx, cargo_update);
                 }
                 if let Some(const_anon) = const_anon {
-                    diag.span_suggestion(
-                        const_anon,
-                        fluent::lint_const_anon,
-                        "_",
-                        Applicability::MachineApplicable,
-                    );
+                    diag.note(fluent::lint_exception);
+                    if let Some(const_anon) = const_anon {
+                        diag.span_suggestion(
+                            const_anon,
+                            fluent::lint_const_anon,
+                            "_",
+                            Applicability::MachineApplicable,
+                        );
+                    }
                 }
+
+                diag.note(fluent::lint_non_local_definitions_deprecation);
             }
             NonLocalDefinitionsDiag::MacroRules {
                 depth,

compiler/rustc_lint/src/non_local_def.rs

@@ -202,8 +202,7 @@ impl<'tcx> LateLintPass<'tcx> for NonLocalDefinitions {
                 // Get the span of the parent const item ident (if it's a not a const anon).
                 //
                 // Used to suggest changing the const item to a const anon.
-                let span_for_const_anon_suggestion = if self.body_depth == 1
-                    && parent_def_kind == DefKind::Const
+                let span_for_const_anon_suggestion = if parent_def_kind == DefKind::Const
                     && parent_opt_item_name != Some(kw::Underscore)
                     && let Some(parent) = parent.as_local()
                     && let Node::Item(item) = cx.tcx.hir_node_by_def_id(parent)
@@ -215,6 +214,9 @@ impl<'tcx> LateLintPass<'tcx> for NonLocalDefinitions {
                     None
                 };
 
+                let const_anon = matches!(parent_def_kind, DefKind::Const | DefKind::Static { .. })
+                    .then_some(span_for_const_anon_suggestion);
+
                 cx.emit_span_lint(
                     NON_LOCAL_DEFINITIONS,
                     item.span,
@@ -225,7 +227,7 @@ impl<'tcx> LateLintPass<'tcx> for NonLocalDefinitions {
                             .map(|s| s.to_ident_string())
                             .unwrap_or_else(|| "<unnameable>".to_string()),
                         cargo_update: cargo_update(),
-                        const_anon: span_for_const_anon_suggestion,
+                        const_anon,
                     },
                 )
             }

tests/ui/lint/non-local-defs/cargo-update.stderr

@@ -6,9 +6,9 @@ LL | non_local_macro::non_local_impl!(LocalStruct);
    |
    = help: move this `impl` block outside the of the current constant `_IMPL_DEBUG`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
-   = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
    = note: the macro `non_local_macro::non_local_impl` may come from an old version of the `non_local_macro` crate, try updating your dependency with `cargo update -p non_local_macro`
+   = note: anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type are consider to be transparent regarding the nesting level
+   = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
    = note: `#[warn(non_local_definitions)]` on by default
    = note: this warning originates in the macro `non_local_macro::non_local_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
 

tests/ui/lint/non-local-defs/consts.stderr

@@ -9,7 +9,7 @@ LL |     impl Uto for &Test {}
    |
    = help: move this `impl` block outside the of the current constant `Z`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
+   = note: anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type are consider to be transparent regarding the nesting level
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
    = note: `#[warn(non_local_definitions)]` on by default
 
@@ -21,7 +21,7 @@ LL |     impl Uto2 for Test {}
    |
    = help: move this `impl` block outside the of the current static `A`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
+   = note: anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type are consider to be transparent regarding the nesting level
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
@@ -32,7 +32,7 @@ LL |     impl Uto3 for Test {}
    |
    = help: move this `impl` block outside the of the current constant `B`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
+   = note: anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type are consider to be transparent regarding the nesting level
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
@@ -46,7 +46,6 @@ LL | |     }
    |
    = help: move this `impl` block outside the of the current function `main`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
@@ -60,7 +59,6 @@ LL | |         }
    |
    = help: move this `impl` block outside the of the current inline constant `<unnameable>` and up 2 bodies
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
@@ -74,7 +72,7 @@ LL | |         }
    |
    = help: move this `impl` block outside the of the current constant `_` and up 2 bodies
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
+   = note: anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type are consider to be transparent regarding the nesting level
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
@@ -85,7 +83,6 @@ LL |         impl Uto9 for Test {}
    |
    = help: move this `impl` block outside the of the current closure `<unnameable>` and up 2 bodies
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
@@ -96,7 +93,6 @@ LL |         impl Uto10 for Test {}
    |
    = help: move this `impl` block outside the of the current constant expression `<unnameable>` and up 2 bodies
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: 8 warnings emitted

tests/ui/lint/non-local-defs/exhaustive-trait.stderr

@@ -11,7 +11,6 @@ LL | |     }
    |
    = help: move this `impl` block outside the of the current function `main`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
    = note: `#[warn(non_local_definitions)]` on by default
 
@@ -28,7 +27,6 @@ LL | |     }
    |
    = help: move this `impl` block outside the of the current function `main`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
@@ -44,7 +42,6 @@ LL | |     }
    |
    = help: move this `impl` block outside the of the current function `main`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
@@ -60,7 +57,6 @@ LL | |     }
    |
    = help: move this `impl` block outside the of the current function `main`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
@@ -76,7 +72,6 @@ LL | |     }
    |
    = help: move this `impl` block outside the of the current function `main`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
@@ -92,7 +87,6 @@ LL | |     }
    |
    = help: move this `impl` block outside the of the current function `main`
    = note: an `impl` definition is non-local if it is nested inside an item and may impact type checking outside of that item. This can be the case if neither the trait or the self type are at the same nesting level as the `impl`
-   = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
    = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
 
 warning: 6 warnings emitted