First batch of review feedback changes from rust-lang#102110

Author: CleanCut

compiler/rustc_error_messages/locales/en-US/middle.ftl

@@ -18,3 +18,12 @@ middle_limit_invalid =
 
 middle_const_eval_non_int =
     constant evaluation of enum discriminant resulted in non-integer
+
+middle_unknown_layout =
+    the type `{$ty}` has an unknown layout
+
+middle_values_too_big =
+    values of the type `{$ty}` are too big for the current architecture
+
+middle_cannot_be_normalized =
+    unable to determine layout for `{$ty}` because `{$failure_ty}` cannot be normalized

compiler/rustc_error_messages/locales/en-US/passes.ftl

@@ -526,7 +526,7 @@ passes_no_main_function =
     .main_must_be_defined_at_crate = the main function must be defined at the crate level{$has_filename ->
         [true] {" "}(in `{$filename}`)
         *[false] {""}
-        }
+    }
     .consider_adding_main_to_file = consider adding a `main` function to `{$filename}`
     .consider_adding_main_at_crate = consider adding a `main` function at the crate level
     .teach_note = If you don't know the basics of Rust, you can go look to the Rust Book to get started: https://doc.rust-lang.org/book/

compiler/rustc_middle/src/ty/layout.rs

@@ -191,10 +191,29 @@ pub enum LayoutError<'tcx> {
 
 impl<'a> IntoDiagnostic<'a, !> for LayoutError<'a> {
     fn into_diagnostic(self, handler: &'a Handler) -> DiagnosticBuilder<'a, !> {
-        handler.struct_fatal(self.to_string())
+        let mut diag = handler.struct_fatal("");
+
+        match self {
+            LayoutError::Unknown(ty) => {
+                diag.set_arg("ty", ty);
+                diag.set_primary_message(rustc_errors::fluent::middle::unknown_layout);
+            }
+            LayoutError::SizeOverflow(ty) => {
+                diag.set_arg("ty", ty);
+                diag.set_primary_message(rustc_errors::fluent::middle::values_too_big);
+            }
+            LayoutError::NormalizationFailure(ty, e) => {
+                diag.set_arg("ty", ty);
+                diag.set_arg("failure_ty", e.get_type_for_failure());
+                diag.set_primary_message(rustc_errors::fluent::middle::cannot_be_normalized);
+            }
+        }
+        diag
     }
 }
 
+// FIXME: Once the other errors that embed this error have been converted to translateable
+// diagnostics, this Display impl should be removed.
 impl<'tcx> fmt::Display for LayoutError<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self {

compiler/rustc_passes/src/diagnostic_items.rs

@@ -14,7 +14,7 @@ use rustc_hir::diagnostic_items::DiagnosticItems;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::TyCtxt;
 use rustc_span::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
-use rustc_span::symbol::{sym, Symbol};
+use rustc_span::symbol::{kw::Empty, sym, Symbol};
 
 use crate::errors::{DuplicateDiagnosticItem, DuplicateDiagnosticItemInCrate};
 
@@ -46,7 +46,7 @@ fn collect_item(tcx: TyCtxt<'_>, items: &mut DiagnosticItems, name: Symbol, item
                 None => tcx.sess.emit_err(DuplicateDiagnosticItemInCrate {
                     span: orig_span,
                     // FIXME: We should not provide `name` to `orig_crate_name`. How do you create a blank/empty symbol?
-                    orig_crate_name: orig_crate_name.unwrap_or(name),
+                    orig_crate_name: orig_crate_name.unwrap_or(Empty),
                     have_orig_crate_name: orig_crate_name.map(|_| ()),
                     crate_name: tcx.crate_name(item_def_id.krate),
                     name,

compiler/rustc_passes/src/errors.rs

@@ -830,14 +830,6 @@ pub struct UnrecognizedField {
     pub name: Symbol,
 }
 
-#[derive(Diagnostic)]
-#[diag(passes::layout)]
-pub struct Layout {
-    #[primary_span]
-    pub span: Span,
-    pub layout_error: String,
-}
-
 #[derive(Diagnostic)]
 #[diag(passes::feature_stable_twice, code = "E0711")]
 pub struct FeatureStableTwice {
@@ -1259,7 +1251,7 @@ pub struct IncorrectTarget<'a> {
     pub span: Span,
     #[label]
     pub generics_span: Span,
-    pub name: &'a str,
+    pub name: &'a str, // cannot be symbol because it renders e.g. `r#fn` instead of `fn`
     pub kind: &'static str,
     pub num: usize,
     pub actual_num: usize,

compiler/rustc_passes/src/lang_items.rs

@@ -20,7 +20,7 @@ use rustc_hir::lang_items::{extract, GenericRequirement, ITEM_REFS};
 use rustc_hir::{HirId, LangItem, LanguageItems, Target};
 use rustc_middle::ty::TyCtxt;
 use rustc_session::cstore::ExternCrate;
-use rustc_span::{Span, Symbol};
+use rustc_span::{symbol::kw::Empty, Span};
 
 use rustc_middle::ty::query::Providers;
 
@@ -66,7 +66,7 @@ impl<'tcx> LanguageItemCollector<'tcx> {
                 let local_span = self.tcx.hir().span_if_local(item_def_id);
                 let lang_item_name = LangItem::from_u32(item_index as u32).unwrap().name();
                 let crate_name = self.tcx.crate_name(item_def_id.krate);
-                let mut dependency_of = Symbol::intern("");
+                let mut dependency_of = Empty;
                 let is_local = item_def_id.is_local();
                 let path = if is_local {
                     String::new()
@@ -80,8 +80,8 @@ impl<'tcx> LanguageItemCollector<'tcx> {
                         .into()
                 };
                 let first_defined_span = self.tcx.hir().span_if_local(original_def_id);
-                let mut orig_crate_name = Symbol::intern("");
-                let mut orig_dependency_of = Symbol::intern("");
+                let mut orig_crate_name = Empty;
+                let mut orig_dependency_of = Empty;
                 let orig_is_local = original_def_id.is_local();
                 let orig_path = if orig_is_local {
                     String::new()

compiler/rustc_passes/src/layout_test.rs

@@ -3,11 +3,12 @@ use rustc_hir::def::DefKind;
 use rustc_hir::def_id::LocalDefId;
 use rustc_middle::ty::layout::{HasParamEnv, HasTyCtxt, LayoutError, LayoutOfHelpers, TyAndLayout};
 use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
+use rustc_span::source_map::Spanned;
 use rustc_span::symbol::sym;
 use rustc_span::Span;
 use rustc_target::abi::{HasDataLayout, TargetDataLayout};
 
-use crate::errors::{Abi, Align, HomogeneousAggregate, Layout, LayoutOf, Size, UnrecognizedField};
+use crate::errors::{Abi, Align, HomogeneousAggregate, LayoutOf, Size, UnrecognizedField};
 
 pub fn test_layout(tcx: TyCtxt<'_>) {
     if tcx.features().rustc_attrs {
@@ -91,9 +92,9 @@ fn dump_layout_of<'tcx>(tcx: TyCtxt<'tcx>, item_def_id: LocalDefId, attr: &Attri
         }
 
         Err(layout_error) => {
-            tcx.sess.emit_err(Layout {
+            tcx.sess.emit_fatal(Spanned {
+                node: layout_error,
                 span: tcx.def_span(item_def_id.to_def_id()),
-                layout_error: format!("{:?}", layout_error),
             });
         }
     }

src/test/ui/associated-types/issue-85103.rs

@@ -4,6 +4,6 @@ use std::borrow::Cow;
 
 #[rustc_layout(debug)]
 type Edges<'a, E> = Cow<'a, [E]>;
-//~^ ERROR layout error: NormalizationFailure
+//~^ 6:1: 6:18: unable to determine layout for `<[E] as ToOwned>::Owned` because `<[E] as ToOwned>::Owned` cannot be normalized
 
 fn main() {}

src/test/ui/associated-types/issue-85103.stderr

@@ -1,4 +1,4 @@
-error: layout error: NormalizationFailure(<[E] as std::borrow::ToOwned>::Owned, Type(<[E] as std::borrow::ToOwned>::Owned))
+error: unable to determine layout for `<[E] as ToOwned>::Owned` because `<[E] as ToOwned>::Owned` cannot be normalized
   --> $DIR/issue-85103.rs:6:1
    |
 LL | type Edges<'a, E> = Cow<'a, [E]>;