Auto merge of #111677 - fee1-dead-contrib:rustc_const_eval-translatable, r=oli-obk,RalfJung

Use translatable diagnostics in `rustc_const_eval`

This PR:

* adds a `no_span` parameter to `note` / `help` attributes when using `Subdiagnostic` to allow adding notes/helps without using a span
* has minor tweaks and changes to error messages

compiler/rustc_mir_transform/src/const_prop.rs

@@ -4,6 +4,7 @@
 use either::Right;
 
 use rustc_const_eval::const_eval::CheckAlignment;
+use rustc_const_eval::ReportErrorExt;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::DefKind;
 use rustc_index::bit_set::BitSet;
@@ -37,6 +38,7 @@ macro_rules! throw_machine_stop_str {
     ($($tt:tt)*) => {{
         // We make a new local type for it. The type itself does not carry any information,
         // but its vtable (for the `MachineStopType` trait) does.
+        #[derive(Debug)]
         struct Zst;
         // Printing this type shows the desired string.
         impl std::fmt::Display for Zst {
@@ -44,7 +46,17 @@ macro_rules! throw_machine_stop_str {
                 write!(f, $($tt)*)
             }
         }
-        impl rustc_middle::mir::interpret::MachineStopType for Zst {}
+
+        impl rustc_middle::mir::interpret::MachineStopType for Zst {
+            fn diagnostic_message(&self) -> rustc_errors::DiagnosticMessage {
+                self.to_string().into()
+            }
+
+            fn add_args(
+                self: Box<Self>,
+                _: &mut dyn FnMut(std::borrow::Cow<'static, str>, rustc_errors::DiagnosticArgValue<'static>),
+            ) {}
+        }
         throw_machine_stop!(Zst)
     }};
 }
@@ -374,7 +386,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
                 op
             }
             Err(e) => {
-                trace!("get_const failed: {}", e);
+                trace!("get_const failed: {:?}", e.into_kind().debug());
                 return None;
             }
         };

compiler/rustc_mir_transform/src/const_prop_lint.rs

@@ -9,6 +9,7 @@ use rustc_const_eval::interpret::Immediate;
 use rustc_const_eval::interpret::{
     self, InterpCx, InterpResult, LocalValue, MemoryKind, OpTy, Scalar, StackPopCleanup,
 };
+use rustc_const_eval::ReportErrorExt;
 use rustc_hir::def::DefKind;
 use rustc_hir::HirId;
 use rustc_index::bit_set::BitSet;
@@ -232,7 +233,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
                 op
             }
             Err(e) => {
-                trace!("get_const failed: {}", e);
+                trace!("get_const failed: {:?}", e.into_kind().debug());
                 return None;
             }
         };
@@ -272,8 +273,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
                 // dedicated error variants should be introduced instead.
                 assert!(
                     !error.kind().formatted_string(),
-                    "const-prop encountered formatting error: {}",
-                    error
+                    "const-prop encountered formatting error: {error:?}",
                 );
                 None
             }

compiler/rustc_mir_transform/src/errors.rs

@@ -163,7 +163,14 @@ impl<'a, P: std::fmt::Debug> DecorateLint<'a, ()> for AssertLint<P> {
         self,
         diag: &'b mut DiagnosticBuilder<'a, ()>,
     ) -> &'b mut DiagnosticBuilder<'a, ()> {
-        diag.span_label(self.span(), format!("{:?}", self.panic()));
+        let span = self.span();
+        let assert_kind = self.panic();
+        let message = assert_kind.diagnostic_message();
+        assert_kind.add_args(&mut |name, value| {
+            diag.set_arg(name, value);
+        });
+        diag.span_label(span, message);
+
         diag
     }
 
@@ -191,7 +198,7 @@ impl<P> AssertLint<P> {
             AssertLint::ArithmeticOverflow(sp, _) | AssertLint::UnconditionalPanic(sp, _) => *sp,
         }
     }
-    pub fn panic(&self) -> &AssertKind<P> {
+    pub fn panic(self) -> AssertKind<P> {
         match self {
             AssertLint::ArithmeticOverflow(_, p) | AssertLint::UnconditionalPanic(_, p) => p,
         }