Rollup merge of #98420 - davidtwco:translation-lint-fixes-and-more-migration, r=compiler-errors

translation: lint fix + more migration

- Unfortunately, the diagnostic lints are very broken and trigger much more often than they should. This PR corrects the conditional which checks if the function call being made is to a diagnostic function so that it returns in every intended case.
- The `rustc_lint_diagnostics` attribute is used by the diagnostic translation/struct migration lints to identify calls where non-translatable diagnostics or diagnostics outwith impls are being created. Any function used in creating a diagnostic should be annotated with this attribute so this PR adds the attribute to many more functions.
- Port the diagnostics from the `rustc_privacy` crate and enable the lints for that crate.

r? ``@compiler-errors``

1 files changed, 75 insertions, 0 deletions

diff --git a/compiler/rustc_privacy/src/errors.rs b/compiler/rustc_privacy/src/errors.rs
new file mode 100644
index 00000000000..482721d373a
--- /dev/null
+++ b/compiler/rustc_privacy/src/errors.rs
@@ -0,0 +1,75 @@
+use rustc_macros::{SessionDiagnostic, SessionSubdiagnostic};
+use rustc_span::{Span, Symbol};
+
+#[derive(SessionDiagnostic)]
+#[error(privacy::field_is_private, code = "E0451")]
+pub struct FieldIsPrivate {
+    #[primary_span]
+    pub span: Span,
+    pub field_name: Symbol,
+    pub variant_descr: &'static str,
+    pub def_path_str: String,
+    #[subdiagnostic]
+    pub label: FieldIsPrivateLabel,
+}
+
+#[derive(SessionSubdiagnostic)]
+pub enum FieldIsPrivateLabel {
+    #[label(privacy::field_is_private_is_update_syntax_label)]
+    IsUpdateSyntax {
+        #[primary_span]
+        span: Span,
+        field_name: Symbol,
+    },
+    #[label(privacy::field_is_private_label)]
+    Other {
+        #[primary_span]
+        span: Span,
+    },
+}
+
+#[derive(SessionDiagnostic)]
+#[error(privacy::item_is_private)]
+pub struct ItemIsPrivate<'a> {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    pub kind: &'a str,
+    pub descr: String,
+}
+
+#[derive(SessionDiagnostic)]
+#[error(privacy::unnamed_item_is_private)]
+pub struct UnnamedItemIsPrivate {
+    #[primary_span]
+    pub span: Span,
+    pub kind: &'static str,
+}
+
+// Duplicate of `InPublicInterface` but with a different error code, shares the same slug.
+#[derive(SessionDiagnostic)]
+#[error(privacy::in_public_interface, code = "E0445")]
+pub struct InPublicInterfaceTraits<'a> {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    pub vis_descr: &'static str,
+    pub kind: &'a str,
+    pub descr: String,
+    #[label(privacy::visibility_label)]
+    pub vis_span: Span,
+}
+
+// Duplicate of `InPublicInterfaceTraits` but with a different error code, shares the same slug.
+#[derive(SessionDiagnostic)]
+#[error(privacy::in_public_interface, code = "E0446")]
+pub struct InPublicInterface<'a> {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    pub vis_descr: &'static str,
+    pub kind: &'a str,
+    pub descr: String,
+    #[label(privacy::visibility_label)]
+    pub vis_span: Span,
+}