Migrate 'lossy int2ptr cast' diagnostic

Author: clubby789

compiler/rustc_hir_typeck/messages.ftl

@@ -63,6 +63,11 @@ hir_typeck_lang_start_incorrect_param = parameter {$param_num} of the `start` la
 hir_typeck_lang_start_incorrect_ret_ty = the return type of the `start` lang item is incorrect
     .suggestion = change the type from `{$found_ty}` to `{$expected_ty}`
 
+hir_typeck_lossy_provenance_int2ptr =
+    strict provenance disallows casting integer `{$expr_ty}` to pointer `{$cast_ty}`
+    .suggestion = use `.with_addr()` to adjust a valid pointer in the same allocation, to this address
+    .help = if you can't comply with strict provenance and don't have a pointer with the correct provenance you can use `std::ptr::from_exposed_addr()` instead
+
 hir_typeck_lossy_provenance_ptr2int =
     under strict provenance it is considered bad style to cast pointer `{$expr_ty}` to integer `{$cast_ty}`
     .suggestion = use `.addr()` to obtain the address of a pointer

compiler/rustc_hir_typeck/src/cast.rs

@@ -1040,29 +1040,17 @@ impl<'a, 'tcx> CastCheck<'tcx> {
     }
 
     fn fuzzy_provenance_int2ptr_lint(&self, fcx: &FnCtxt<'a, 'tcx>) {
-        fcx.tcx.struct_span_lint_hir(
+        let sugg = errors::LossyProvenanceInt2PtrSuggestion {
+            lo: self.expr_span.shrink_to_lo(),
+            hi: self.expr_span.shrink_to_hi().to(self.cast_span),
+        };
+        let lint =
+            errors::LossyProvenanceInt2Ptr { expr_ty: self.expr_ty, cast_ty: self.cast_ty, sugg };
+        fcx.tcx.emit_spanned_lint(
             lint::builtin::FUZZY_PROVENANCE_CASTS,
             self.expr.hir_id,
             self.span,
-            DelayDm(|| format!(
-                "strict provenance disallows casting integer `{}` to pointer `{}`",
-                self.expr_ty, self.cast_ty
-            )),
-            |lint| {
-                let msg = "use `.with_addr()` to adjust a valid pointer in the same allocation, to this address";
-                let suggestions = vec![
-                    (self.expr_span.shrink_to_lo(), String::from("(...).with_addr(")),
-                    (self.expr_span.shrink_to_hi().to(self.cast_span), String::from(")")),
-                ];
-
-                lint.multipart_suggestion(msg, suggestions, Applicability::MaybeIncorrect);
-                lint.help(
-                    "if you can't comply with strict provenance and don't have a pointer with \
-                    the correct provenance you can use `std::ptr::from_exposed_addr()` instead"
-                 );
-
-                lint
-            },
+            lint,
         );
     }
 

compiler/rustc_hir_typeck/src/errors.rs

@@ -231,6 +231,25 @@ pub struct LangStartIncorrectRetTy<'tcx> {
     pub found_ty: Ty<'tcx>,
 }
 
+#[derive(LintDiagnostic)]
+#[diag(hir_typeck_lossy_provenance_int2ptr)]
+#[help]
+pub struct LossyProvenanceInt2Ptr<'tcx> {
+    pub expr_ty: Ty<'tcx>,
+    pub cast_ty: Ty<'tcx>,
+    #[subdiagnostic]
+    pub sugg: LossyProvenanceInt2PtrSuggestion,
+}
+
+#[derive(Subdiagnostic)]
+#[multipart_suggestion(hir_typeck_suggestion, applicability = "has-placeholders")]
+pub struct LossyProvenanceInt2PtrSuggestion {
+    #[suggestion_part(code = "(...).with_addr(")]
+    pub lo: Span,
+    #[suggestion_part(code = ")")]
+    pub hi: Span,
+}
+
 #[derive(LintDiagnostic)]
 #[diag(hir_typeck_lossy_provenance_ptr2int)]
 #[help]