Rollup merge of #115771 - RalfJung:no-more-const-err-lint, r=oli-obk

cleanup leftovers of const_err lint

Some code / comments seem to not have been updated when const_err was turned into a hard error, so we can do a bit of cleanup here.

r? `@oli-obk`

compiler/rustc_const_eval/src/const_eval/error.rs

@@ -4,7 +4,6 @@ use rustc_errors::{DiagnosticArgValue, DiagnosticMessage, IntoDiagnostic, IntoDi
 use rustc_middle::mir::AssertKind;
 use rustc_middle::ty::TyCtxt;
 use rustc_middle::ty::{layout::LayoutError, ConstInt};
-use rustc_span::source_map::Spanned;
 use rustc_span::{ErrorGuaranteed, Span, Symbol};
 
 use super::InterpCx;
@@ -132,7 +131,8 @@ where
 {
     // Special handling for certain errors
     match error {
-        // Don't emit a new diagnostic for these errors
+        // Don't emit a new diagnostic for these errors, they are already reported elsewhere or
+        // should remain silent.
         err_inval!(Layout(LayoutError::Unknown(_))) | err_inval!(TooGeneric) => {
             ErrorHandled::TooGeneric
         }
@@ -140,27 +140,8 @@ where
         err_inval!(Layout(LayoutError::ReferencesError(guar))) => {
             ErrorHandled::Reported(guar.into())
         }
-        err_inval!(Layout(layout_error @ LayoutError::SizeOverflow(_))) => {
-            // We must *always* hard error on these, even if the caller wants just a lint.
-            // The `message` makes little sense here, this is a more serious error than the
-            // caller thinks anyway.
-            // See <https://github.com/rust-lang/rust/pull/63152>.
-            let (our_span, frames) = get_span_and_frames();
-            let span = span.unwrap_or(our_span);
-            let mut err =
-                tcx.sess.create_err(Spanned { span, node: layout_error.into_diagnostic() });
-            err.code(rustc_errors::error_code!(E0080));
-            let Some((mut err, handler)) = err.into_diagnostic() else {
-                panic!("did not emit diag");
-            };
-            for frame in frames {
-                err.eager_subdiagnostic(handler, frame);
-            }
-
-            ErrorHandled::Reported(handler.emit_diagnostic(&mut err).unwrap().into())
-        }
+        // Report remaining errors.
         _ => {
-            // Report as hard error.
             let (our_span, frames) = get_span_and_frames();
             let span = span.unwrap_or(our_span);
             let err = mk(span, frames);

compiler/rustc_const_eval/src/const_eval/eval_queries.rs

@@ -372,7 +372,7 @@ pub fn eval_to_allocation_raw_provider<'tcx>(
             };
             let alloc_id = mplace.ptr().provenance.unwrap();
 
-            // Validation failed, report an error. This is always a hard error.
+            // Validation failed, report an error.
             if let Err(error) = validation {
                 let (error, backtrace) = error.into_parts();
                 backtrace.print_backtrace();

tests/ui/limits/issue-55878.stderr

@@ -1,6 +1,8 @@
-error[E0080]: values of the type `[u8; usize::MAX]` are too big for the current architecture
+error[E0080]: evaluation of constant value failed
   --> $SRC_DIR/core/src/mem/mod.rs:LL:COL
    |
+   = note: values of the type `[u8; usize::MAX]` are too big for the current architecture
+   |
 note: inside `std::mem::size_of::<[u8; usize::MAX]>`
   --> $SRC_DIR/core/src/mem/mod.rs:LL:COL
 note: inside `main`

tests/ui/limits/issue-56762.rs

@@ -14,8 +14,10 @@ impl TooBigArray {
 }
 
 static MY_TOO_BIG_ARRAY_1: TooBigArray = TooBigArray::new();
-//~^ ERROR values of the type `[u8; 2305843009213693951]` are too big
+//~^ ERROR could not evaluate static initializer
+//~| too big
 static MY_TOO_BIG_ARRAY_2: [u8; HUGE_SIZE] = [0x00; HUGE_SIZE];
-//~^ ERROR values of the type `[u8; 2305843009213693951]` are too big
+//~^ ERROR could not evaluate static initializer
+//~| too big
 
 fn main() { }

tests/ui/limits/issue-56762.stderr

@@ -1,14 +1,14 @@
-error[E0080]: values of the type `[u8; 2305843009213693951]` are too big for the current architecture
+error[E0080]: could not evaluate static initializer
   --> $DIR/issue-56762.rs:16:1
    |
 LL | static MY_TOO_BIG_ARRAY_1: TooBigArray = TooBigArray::new();
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ values of the type `[u8; 2305843009213693951]` are too big for the current architecture
 
-error[E0080]: values of the type `[u8; 2305843009213693951]` are too big for the current architecture
-  --> $DIR/issue-56762.rs:18:1
+error[E0080]: could not evaluate static initializer
+  --> $DIR/issue-56762.rs:19:1
    |
 LL | static MY_TOO_BIG_ARRAY_2: [u8; HUGE_SIZE] = [0x00; HUGE_SIZE];
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ values of the type `[u8; 2305843009213693951]` are too big for the current architecture
 
 error: aborting due to 2 previous errors