Rollup merge of #102137 - b-naber:lazy-const-val-conversion, r=lcnr

Don't convert valtree to constvalue during normalization

r? ``@lcnr``

compiler/rustc_trait_selection/src/traits/query/normalize.rs

@@ -351,25 +351,7 @@ impl<'cx, 'tcx> FallibleTypeFolder<'tcx> for QueryNormalizer<'cx, 'tcx> {
         &mut self,
         constant: mir::ConstantKind<'tcx>,
     ) -> Result<mir::ConstantKind<'tcx>, Self::Error> {
-        Ok(match constant {
+        constant.try_super_fold_with(self)
-            mir::ConstantKind::Ty(c) => {
-                let const_folded = c.try_super_fold_with(self)?;
-                match const_folded.kind() {
-                    ty::ConstKind::Value(valtree) => {
-                        let tcx = self.infcx.tcx;
-                        let ty = const_folded.ty();
-                        let const_val = tcx.valtree_to_const_val((ty, valtree));
-                        debug!(?ty, ?valtree, ?const_val);
-
-                        mir::ConstantKind::Val(const_val, ty)
-                    }
-                    _ => mir::ConstantKind::Ty(const_folded),
-                }
-            }
-            mir::ConstantKind::Val(_, _) | mir::ConstantKind::Unevaluated(..) => {
-                constant.try_super_fold_with(self)?
-            }
-        })
     }
 
     #[inline]

src/test/ui/transmutability/malformed-program-gracefulness/wrong-type-assume.rs

@@ -24,10 +24,6 @@ mod assert {
             Src,
             Context,
             { from_options(ASSUME_ALIGNMENT, ASSUME_LIFETIMES, ASSUME_SAFETY, ASSUME_VALIDITY) }
-            //~^ ERROR E0080
-            //~| ERROR E0080
-            //~| ERROR E0080
-            //~| ERROR E0080
         >,
     {}
 

src/test/ui/transmutability/malformed-program-gracefulness/wrong-type-assume.stderr

@@ -1,52 +1,27 @@
 error[E0308]: mismatched types
-  --> $DIR/wrong-type-assume.rs:53:51
+  --> $DIR/wrong-type-assume.rs:49:51
    |
 LL |     assert::is_transmutable::<Src, Dst, Context, {0u8}, false, false, false>();
    |                                                   ^^^ expected `bool`, found `u8`
 
-error[E0080]: evaluation of `assert::is_transmutable::<test::Src, test::Dst, test::Context, {0u8}, false, false, false>::{constant#0}` failed
-  --> $DIR/wrong-type-assume.rs:26:15
-   |
-LL |             { from_options(ASSUME_ALIGNMENT, ASSUME_LIFETIMES, ASSUME_SAFETY, ASSUME_VALIDITY) }
-   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ referenced constant has errors
-
 error[E0308]: mismatched types
-  --> $DIR/wrong-type-assume.rs:54:58
+  --> $DIR/wrong-type-assume.rs:50:58
    |
 LL |     assert::is_transmutable::<Src, Dst, Context, false, {0u8}, false, false>();
    |                                                          ^^^ expected `bool`, found `u8`
 
-error[E0080]: evaluation of `assert::is_transmutable::<test::Src, test::Dst, test::Context, false, {0u8}, false, false>::{constant#0}` failed
-  --> $DIR/wrong-type-assume.rs:26:15
-   |
-LL |             { from_options(ASSUME_ALIGNMENT, ASSUME_LIFETIMES, ASSUME_SAFETY, ASSUME_VALIDITY) }
-   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ referenced constant has errors
-
 error[E0308]: mismatched types
-  --> $DIR/wrong-type-assume.rs:55:65
+  --> $DIR/wrong-type-assume.rs:51:65
    |
 LL |     assert::is_transmutable::<Src, Dst, Context, false, false, {0u8}, false>();
    |                                                                 ^^^ expected `bool`, found `u8`
 
-error[E0080]: evaluation of `assert::is_transmutable::<test::Src, test::Dst, test::Context, false, false, {0u8}, false>::{constant#0}` failed
-  --> $DIR/wrong-type-assume.rs:26:15
-   |
-LL |             { from_options(ASSUME_ALIGNMENT, ASSUME_LIFETIMES, ASSUME_SAFETY, ASSUME_VALIDITY) }
-   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ referenced constant has errors
-
 error[E0308]: mismatched types
-  --> $DIR/wrong-type-assume.rs:56:72
+  --> $DIR/wrong-type-assume.rs:52:72
    |
 LL |     assert::is_transmutable::<Src, Dst, Context, false, false, false, {0u8}>();
    |                                                                        ^^^ expected `bool`, found `u8`
 
-error[E0080]: evaluation of `assert::is_transmutable::<test::Src, test::Dst, test::Context, false, false, false, {0u8}>::{constant#0}` failed
+error: aborting due to 4 previous errors
-  --> $DIR/wrong-type-assume.rs:26:15
-   |
-LL |             { from_options(ASSUME_ALIGNMENT, ASSUME_LIFETIMES, ASSUME_SAFETY, ASSUME_VALIDITY) }
-   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ referenced constant has errors
 
-error: aborting due to 8 previous errors
+For more information about this error, try `rustc --explain E0308`.
-
-Some errors have detailed explanations: E0080, E0308.
-For more information about an error, try `rustc --explain E0080`.