Auto merge of #120393 - Urgau:rfc3373-non-local-defs, r=WaffleLapkin

Implement RFC 3373: Avoid non-local definitions in functions

This PR implements [RFC 3373: Avoid non-local definitions in functions](https://github.com/rust-lang/rust/issues/120363).

compiler/rustc_lint/src/lints.rs

@@ -1334,6 +1334,45 @@ pub struct SuspiciousDoubleRefCloneDiag<'a> {
     pub ty: Ty<'a>,
 }
 
+// non_local_defs.rs
+#[derive(LintDiagnostic)]
+pub enum NonLocalDefinitionsDiag {
+    #[diag(lint_non_local_definitions_impl)]
+    #[help]
+    #[note(lint_non_local)]
+    #[note(lint_exception)]
+    #[note(lint_non_local_definitions_deprecation)]
+    Impl {
+        depth: u32,
+        body_kind_descr: &'static str,
+        body_name: String,
+        #[subdiagnostic]
+        cargo_update: Option<NonLocalDefinitionsCargoUpdateNote>,
+        #[suggestion(lint_const_anon, code = "_", applicability = "machine-applicable")]
+        const_anon: Option<Span>,
+    },
+    #[diag(lint_non_local_definitions_macro_rules)]
+    #[help]
+    #[note(lint_non_local)]
+    #[note(lint_exception)]
+    #[note(lint_non_local_definitions_deprecation)]
+    MacroRules {
+        depth: u32,
+        body_kind_descr: &'static str,
+        body_name: String,
+        #[subdiagnostic]
+        cargo_update: Option<NonLocalDefinitionsCargoUpdateNote>,
+    },
+}
+
+#[derive(Subdiagnostic)]
+#[note(lint_non_local_definitions_cargo_update)]
+pub struct NonLocalDefinitionsCargoUpdateNote {
+    pub macro_kind: &'static str,
+    pub macro_name: Symbol,
+    pub crate_name: Symbol,
+}
+
 // pass_by_value.rs
 #[derive(LintDiagnostic)]
 #[diag(lint_pass_by_value)]