Remove more BuiltinLintDiag in rustc_resolve

compiler/rustc_lint/src/early/diagnostics.rs

@@ -118,13 +118,14 @@ fn into_diag(self, dcx: DiagCtxtHandle<'a>, level: Level) -> Diag<'a, ()> {
             }
             BuiltinLintDiag::SingleUseLifetime {
                 param_span,
-                use_span: Some((use_span, elide)),
+                use_span,
+                elidable,
                 deletion_span,
                 ident,
             } => {
                 debug!(?param_span, ?use_span, ?deletion_span);
                 let suggestion = if let Some(deletion_span) = deletion_span {
-                    let (use_span, replace_lt) = if elide {
+                    let (use_span, replace_lt) = if elidable {
                         let use_span =
                             self.sess.source_map().span_extend_while_whitespace(use_span);
                         (use_span, String::new())
@@ -145,9 +146,6 @@ fn into_diag(self, dcx: DiagCtxtHandle<'a>, level: Level) -> Diag<'a, ()> {
                 lints::SingleUseLifetime { suggestion, param_span, use_span, ident }
                     .into_diag(dcx, level)
             }
-            BuiltinLintDiag::SingleUseLifetime { use_span: None, deletion_span, ident, .. } => {
-                lints::UnusedLifetime { deletion_span, ident }.into_diag(dcx, level)
-            }
             BuiltinLintDiag::NamedArgumentUsedPositionally {
                 position_sp_to_replace,
                 position_sp_for_msg,

compiler/rustc_lint/src/lints.rs

@@ -3149,15 +3149,6 @@ pub(crate) struct SingleUseLifetimeSugg {
     pub replace_lt: String,
 }
 
-#[derive(Diagnostic)]
-#[diag("lifetime parameter `{$ident}` never used")]
-pub(crate) struct UnusedLifetime {
-    #[suggestion("elide the unused lifetime", code = "", applicability = "machine-applicable")]
-    pub deletion_span: Option<Span>,
-
-    pub ident: Ident,
-}
-
 #[derive(Diagnostic)]
 #[diag("named argument `{$named_arg_name}` is not used by name")]
 pub(crate) struct NamedArgumentUsedPositionally {

compiler/rustc_lint_defs/src/lib.rs

@@ -681,7 +681,8 @@ pub enum BuiltinLintDiag {
         deletion_span: Option<Span>,
         /// Span of the single use, or None if the lifetime is never used.
         /// If true, the lifetime will be fully elided.
-        use_span: Option<(Span, bool)>,
+        use_span: Span,
+        elidable: bool,
         ident: Ident,
     },
     NamedArgumentUsedPositionally {

compiler/rustc_resolve/src/errors.rs

@@ -1583,3 +1583,12 @@ fn into_diag(self, dcx: DiagCtxtHandle<'a>, level: Level) -> Diag<'a, G> {
         diag
     }
 }
+
+#[derive(Diagnostic)]
+#[diag("lifetime parameter `{$ident}` never used")]
+pub(crate) struct UnusedLifetime {
+    #[suggestion("elide the unused lifetime", code = "", applicability = "machine-applicable")]
+    pub deletion_span: Option<Span>,
+
+    pub ident: Ident,
+}

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -3653,7 +3653,8 @@ pub(crate) fn maybe_report_lifetime_uses(
                         param.ident.span,
                         lint::BuiltinLintDiag::SingleUseLifetime {
                             param_span: param.ident.span,
-                            use_span: Some((use_span, elidable)),
+                            use_span,
+                            elidable,
                             deletion_span,
                             ident: param.ident,
                         },
@@ -3669,12 +3670,7 @@ pub(crate) fn maybe_report_lifetime_uses(
                             lint::builtin::UNUSED_LIFETIMES,
                             param.id,
                             param.ident.span,
-                            lint::BuiltinLintDiag::SingleUseLifetime {
-                                param_span: param.ident.span,
-                                use_span: None,
-                                deletion_span,
-                                ident: param.ident,
-                            },
+                            errors::UnusedLifetime { deletion_span, ident: param.ident },
                         );
                     }
                 }