Rollup merge of #77825 - ethanboxx:min_const_generics_diagnostic, r=lcnr

`min_const_generics` diagnostics improvements

As disscussed in [zulip/project-const-generics/non-trivial anonymous constant](https://rust-lang.zulipchat.com/#narrow/stream/260443-project-const-generics/topic/non-trivial.20anonymous.20constants).

This is my first PR on the compiler.

@lcnr is mentoring me on this PR.

Related to #60551.

56 files changed, 185 insertions, 192 deletions

diff --git a/compiler/rustc_resolve/src/diagnostics.rs b/compiler/rustc_resolve/src/diagnostics.rs
index e3cf6d12bd5..774a147c114 100644
--- a/compiler/rustc_resolve/src/diagnostics.rs
+++ b/compiler/rustc_resolve/src/diagnostics.rs
@@ -469,24 +469,17 @@ impl<'a> Resolver<'a> {
             ResolutionError::ParamInNonTrivialAnonConst { name, is_type } => {
                 let mut err = self.session.struct_span_err(
                     span,
-                    "generic parameters must not be used inside of non-trivial constant values",
-                );
-                err.span_label(
-                    span,
-                    &format!(
-                        "non-trivial anonymous constants must not depend on the parameter `{}`",
-                        name
-                    ),
+                    "generic parameters may not be used in const operations",
                 );
+                err.span_label(span, &format!("cannot perform const operation using `{}`", name));
 
                 if is_type {
-                    err.note("type parameters are currently not permitted in anonymous constants");
+                    err.note("type parameters may not be used in const expressions");
                 } else {
-                    err.help(
-                        &format!("it is currently only allowed to use either `{0}` or `{{ {0} }}` as generic constants",
-                                 name
-                        )
-                    );
+                    err.help(&format!(
+                        "const parameters may only be used as standalone arguments, i.e. `{}`",
+                        name
+                    ));
                 }
 
                 err
diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index fe8f5926385..6677a5ffe28 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -218,7 +218,7 @@ enum ResolutionError<'a> {
     ParamInTyOfConstParam(Symbol),
     /// constant values inside of type parameter defaults must not depend on generic parameters.
     ParamInAnonConstInTyDefault(Symbol),
-    /// generic parameters must not be used inside of non-trivial constant values.
+    /// generic parameters must not be used inside const evaluations.
     ///
     /// This error is only emitted when using `min_const_generics`.
     ParamInNonTrivialAnonConst { name: Symbol, is_type: bool },
diff --git a/src/test/ui/const-generics/array-size-in-generic-struct-param.min.stderr b/src/test/ui/const-generics/array-size-in-generic-struct-param.min.stderr
index 0fc45513cd7..cfaacf7a5be 100644
--- a/src/test/ui/const-generics/array-size-in-generic-struct-param.min.stderr
+++ b/src/test/ui/const-generics/array-size-in-generic-struct-param.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/array-size-in-generic-struct-param.rs:9:48
    |
 LL | struct ArithArrayLen<const N: usize>([u32; 0 + N]);
-   |                                                ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                                ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/array-size-in-generic-struct-param.rs:20:15
    |
 LL |     arr: [u8; CFG.arr_size],
-   |               ^^^ non-trivial anonymous constants must not depend on the parameter `CFG`
+   |               ^^^ cannot perform const operation using `CFG`
    |
-   = help: it is currently only allowed to use either `CFG` or `{ CFG }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `CFG`
 
 error: `Config` is forbidden as the type of a const generic parameter
   --> $DIR/array-size-in-generic-struct-param.rs:18:21
diff --git a/src/test/ui/const-generics/array-size-in-generic-struct-param.rs b/src/test/ui/const-generics/array-size-in-generic-struct-param.rs
index dd45b6ed278..768180d0813 100644
--- a/src/test/ui/const-generics/array-size-in-generic-struct-param.rs
+++ b/src/test/ui/const-generics/array-size-in-generic-struct-param.rs
@@ -8,7 +8,7 @@
 #[allow(dead_code)]
 struct ArithArrayLen<const N: usize>([u32; 0 + N]);
 //[full]~^ ERROR constant expression depends on a generic parameter
-//[min]~^^ ERROR generic parameters must not be used inside of non-trivial constant values
+//[min]~^^ ERROR generic parameters may not be used in const operations
 
 #[derive(PartialEq, Eq)]
 struct Config {
@@ -19,7 +19,7 @@ struct B<const CFG: Config> {
     //[min]~^ ERROR `Config` is forbidden
     arr: [u8; CFG.arr_size],
     //[full]~^ ERROR constant expression depends on a generic parameter
-    //[min]~^^ ERROR generic parameters must not be used inside of non-trivial
+    //[min]~^^ ERROR generic parameters may not be used in const operations
 }
 
 const C: Config = Config { arr_size: 5 };
diff --git a/src/test/ui/const-generics/const-argument-if-length.min.stderr b/src/test/ui/const-generics/const-argument-if-length.min.stderr
index c666dce479f..bce701ade86 100644
--- a/src/test/ui/const-generics/const-argument-if-length.min.stderr
+++ b/src/test/ui/const-generics/const-argument-if-length.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/const-argument-if-length.rs:19:24
    |
 LL |     pad: [u8; is_zst::<T>()],
-   |                        ^ non-trivial anonymous constants must not depend on the parameter `T`
+   |                        ^ cannot perform const operation using `T`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
 error[E0277]: the size for values of type `T` cannot be known at compilation time
   --> $DIR/const-argument-if-length.rs:17:12
diff --git a/src/test/ui/const-generics/const-argument-if-length.rs b/src/test/ui/const-generics/const-argument-if-length.rs
index 481ff97d68d..a8bffd17b91 100644
--- a/src/test/ui/const-generics/const-argument-if-length.rs
+++ b/src/test/ui/const-generics/const-argument-if-length.rs
@@ -17,7 +17,7 @@ pub struct AtLeastByte<T: ?Sized> {
     value: T,
     //~^ ERROR the size for values of type `T` cannot be known at compilation time
     pad: [u8; is_zst::<T>()],
-    //[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //[min]~^ ERROR generic parameters may not be used in const operations
     //[full]~^^ ERROR evaluation of constant value failed
 }
 
diff --git a/src/test/ui/const-generics/const_evaluatable_checked/feature-gate-const_evaluatable_checked.min.stderr b/src/test/ui/const-generics/const_evaluatable_checked/feature-gate-const_evaluatable_checked.min.stderr
index 4b3235fd087..359c2d2a22f 100644
--- a/src/test/ui/const-generics/const_evaluatable_checked/feature-gate-const_evaluatable_checked.min.stderr
+++ b/src/test/ui/const-generics/const_evaluatable_checked/feature-gate-const_evaluatable_checked.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/feature-gate-const_evaluatable_checked.rs:6:33
    |
 LL | type Arr<const N: usize> = [u8; N - 1];
-   |                                 ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                 ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/const-generics/const_evaluatable_checked/feature-gate-const_evaluatable_checked.rs b/src/test/ui/const-generics/const_evaluatable_checked/feature-gate-const_evaluatable_checked.rs
index d552e0f5430..9746adab29b 100644
--- a/src/test/ui/const-generics/const_evaluatable_checked/feature-gate-const_evaluatable_checked.rs
+++ b/src/test/ui/const-generics/const_evaluatable_checked/feature-gate-const_evaluatable_checked.rs
@@ -4,7 +4,7 @@
 #![cfg_attr(min, feature(min_const_generics))]
 
 type Arr<const N: usize> = [u8; N - 1];
-//[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+//[min]~^ ERROR generic parameters may not be used in const operations
 
 fn test<const N: usize>() -> Arr<N> where Arr<N>: Default {
     //[full]~^ ERROR constant expression depends
diff --git a/src/test/ui/const-generics/const_evaluatable_checked/simple.min.stderr b/src/test/ui/const-generics/const_evaluatable_checked/simple.min.stderr
index 85a15b1e75f..46485262cc4 100644
--- a/src/test/ui/const-generics/const_evaluatable_checked/simple.min.stderr
+++ b/src/test/ui/const-generics/const_evaluatable_checked/simple.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/simple.rs:8:53
    |
 LL | fn test<const N: usize>() -> [u8; N - 1] where [u8; N - 1]: Default {
-   |                                                     ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                                     ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/simple.rs:8:35
    |
 LL | fn test<const N: usize>() -> [u8; N - 1] where [u8; N - 1]: Default {
-   |                                   ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                   ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to 2 previous errors
 
diff --git a/src/test/ui/const-generics/const_evaluatable_checked/simple_fail.min.stderr b/src/test/ui/const-generics/const_evaluatable_checked/simple_fail.min.stderr
index 2eac9505624..981d993f589 100644
--- a/src/test/ui/const-generics/const_evaluatable_checked/simple_fail.min.stderr
+++ b/src/test/ui/const-generics/const_evaluatable_checked/simple_fail.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/simple_fail.rs:7:33
    |
 LL | type Arr<const N: usize> = [u8; N - 1];
-   |                                 ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                 ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/const-generics/const_evaluatable_checked/simple_fail.rs b/src/test/ui/const-generics/const_evaluatable_checked/simple_fail.rs
index 637c940f714..5e2c080927f 100644
--- a/src/test/ui/const-generics/const_evaluatable_checked/simple_fail.rs
+++ b/src/test/ui/const-generics/const_evaluatable_checked/simple_fail.rs
@@ -5,7 +5,7 @@
 #![allow(incomplete_features)]
 
 type Arr<const N: usize> = [u8; N - 1]; //[full]~ ERROR evaluation of constant
-//[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+//[min]~^ ERROR generic parameters may not be used in const operations
 
 fn test<const N: usize>() -> Arr<N> where Arr<N>: Sized {
     todo!()
diff --git a/src/test/ui/const-generics/generic-function-call-in-array-length.min.stderr b/src/test/ui/const-generics/generic-function-call-in-array-length.min.stderr
index e7e968e4c2a..84449018e46 100644
--- a/src/test/ui/const-generics/generic-function-call-in-array-length.min.stderr
+++ b/src/test/ui/const-generics/generic-function-call-in-array-length.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/generic-function-call-in-array-length.rs:9:39
    |
 LL | fn bar<const N: usize>() -> [u32; foo(N)] {
-   |                                       ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                       ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/generic-function-call-in-array-length.rs:12:13
    |
 LL |     [0; foo(N)]
-   |             ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |             ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to 2 previous errors
 
diff --git a/src/test/ui/const-generics/generic-function-call-in-array-length.rs b/src/test/ui/const-generics/generic-function-call-in-array-length.rs
index c8bbae29343..c838070dc95 100644
--- a/src/test/ui/const-generics/generic-function-call-in-array-length.rs
+++ b/src/test/ui/const-generics/generic-function-call-in-array-length.rs
@@ -7,10 +7,10 @@
 const fn foo(n: usize) -> usize { n * 2 }
 
 fn bar<const N: usize>() -> [u32; foo(N)] {
-    //[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //[min]~^ ERROR generic parameters may not be used in const operations
     //[full]~^^ ERROR constant expression depends on a generic parameter
     [0; foo(N)]
-    //[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //[min]~^ ERROR generic parameters may not be used in const operations
 }
 
 fn main() {}
diff --git a/src/test/ui/const-generics/generic-sum-in-array-length.min.stderr b/src/test/ui/const-generics/generic-sum-in-array-length.min.stderr
index 6f157fbbbbb..d3f7143327e 100644
--- a/src/test/ui/const-generics/generic-sum-in-array-length.min.stderr
+++ b/src/test/ui/const-generics/generic-sum-in-array-length.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/generic-sum-in-array-length.rs:7:53
    |
 LL | fn foo<const A: usize, const B: usize>(bar: [usize; A + B]) {}
-   |                                                     ^ non-trivial anonymous constants must not depend on the parameter `A`
+   |                                                     ^ cannot perform const operation using `A`
    |
-   = help: it is currently only allowed to use either `A` or `{ A }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `A`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/generic-sum-in-array-length.rs:7:57
    |
 LL | fn foo<const A: usize, const B: usize>(bar: [usize; A + B]) {}
-   |                                                         ^ non-trivial anonymous constants must not depend on the parameter `B`
+   |                                                         ^ cannot perform const operation using `B`
    |
-   = help: it is currently only allowed to use either `B` or `{ B }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `B`
 
 error: aborting due to 2 previous errors
 
diff --git a/src/test/ui/const-generics/generic-sum-in-array-length.rs b/src/test/ui/const-generics/generic-sum-in-array-length.rs
index 810095b384b..84ddfe055dc 100644
--- a/src/test/ui/const-generics/generic-sum-in-array-length.rs
+++ b/src/test/ui/const-generics/generic-sum-in-array-length.rs
@@ -5,8 +5,8 @@
 #![cfg_attr(min, feature(min_const_generics))]
 
 fn foo<const A: usize, const B: usize>(bar: [usize; A + B]) {}
-//[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
-//[min]~| ERROR generic parameters must not be used inside of non-trivial constant values
+//[min]~^ ERROR generic parameters may not be used in const operations
+//[min]~| ERROR generic parameters may not be used in const operations
 //[full]~^^^ ERROR constant expression depends on a generic parameter
 
 fn main() {}
diff --git a/src/test/ui/const-generics/intrinsics-type_name-as-const-argument.min.stderr b/src/test/ui/const-generics/intrinsics-type_name-as-const-argument.min.stderr
index 307db088bf8..20a8d9fdaab 100644
--- a/src/test/ui/const-generics/intrinsics-type_name-as-const-argument.min.stderr
+++ b/src/test/ui/const-generics/intrinsics-type_name-as-const-argument.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/intrinsics-type_name-as-const-argument.rs:15:44
    |
 LL |     T: Trait<{std::intrinsics::type_name::<T>()}>
-   |                                            ^ non-trivial anonymous constants must not depend on the parameter `T`
+   |                                            ^ cannot perform const operation using `T`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
 error: `&'static str` is forbidden as the type of a const generic parameter
   --> $DIR/intrinsics-type_name-as-const-argument.rs:10:22
diff --git a/src/test/ui/const-generics/intrinsics-type_name-as-const-argument.rs b/src/test/ui/const-generics/intrinsics-type_name-as-const-argument.rs
index 37b6cf4bab9..8971c00ed5a 100644
--- a/src/test/ui/const-generics/intrinsics-type_name-as-const-argument.rs
+++ b/src/test/ui/const-generics/intrinsics-type_name-as-const-argument.rs
@@ -13,7 +13,7 @@ trait Trait<const S: &'static str> {}
 struct Bug<T>
 where
     T: Trait<{std::intrinsics::type_name::<T>()}>
-    //[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //[min]~^ ERROR generic parameters may not be used in const operations
     //[full]~^^ ERROR constant expression depends on a generic parameter
 {
     t: T
diff --git a/src/test/ui/const-generics/issue-61522-array-len-succ.min.stderr b/src/test/ui/const-generics/issue-61522-array-len-succ.min.stderr
index 2c1bc055b28..526807f0a24 100644
--- a/src/test/ui/const-generics/issue-61522-array-len-succ.min.stderr
+++ b/src/test/ui/const-generics/issue-61522-array-len-succ.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-61522-array-len-succ.rs:7:45
    |
 LL | pub struct MyArray<const COUNT: usize>([u8; COUNT + 1]);
-   |                                             ^^^^^ non-trivial anonymous constants must not depend on the parameter `COUNT`
+   |                                             ^^^^^ cannot perform const operation using `COUNT`
    |
-   = help: it is currently only allowed to use either `COUNT` or `{ COUNT }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `COUNT`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-61522-array-len-succ.rs:12:30
    |
 LL |     fn inner(&self) -> &[u8; COUNT + 1] {
-   |                              ^^^^^ non-trivial anonymous constants must not depend on the parameter `COUNT`
+   |                              ^^^^^ cannot perform const operation using `COUNT`
    |
-   = help: it is currently only allowed to use either `COUNT` or `{ COUNT }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `COUNT`
 
 error: aborting due to 2 previous errors
 
diff --git a/src/test/ui/const-generics/issue-61522-array-len-succ.rs b/src/test/ui/const-generics/issue-61522-array-len-succ.rs
index 81443b90d61..8c0a3a03774 100644
--- a/src/test/ui/const-generics/issue-61522-array-len-succ.rs
+++ b/src/test/ui/const-generics/issue-61522-array-len-succ.rs
@@ -6,12 +6,12 @@
 
 pub struct MyArray<const COUNT: usize>([u8; COUNT + 1]);
 //[full]~^ ERROR constant expression depends on a generic parameter
-//[min]~^^ ERROR generic parameters must not be used
+//[min]~^^ ERROR generic parameters may not be used
 
 impl<const COUNT: usize> MyArray<COUNT> {
     fn inner(&self) -> &[u8; COUNT + 1] {
         //[full]~^ ERROR constant expression depends on a generic parameter
-        //[min]~^^ ERROR generic parameters must not be used
+        //[min]~^^ ERROR generic parameters may not be used
         &self.0
     }
 }
diff --git a/src/test/ui/const-generics/issue-67375.min.stderr b/src/test/ui/const-generics/issue-67375.min.stderr
index b13d9fdab0d..3c344edbf1d 100644
--- a/src/test/ui/const-generics/issue-67375.min.stderr
+++ b/src/test/ui/const-generics/issue-67375.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-67375.rs:9:25
    |
 LL |     inner: [(); { [|_: &T| {}; 0].len() }],
-   |                         ^ non-trivial anonymous constants must not depend on the parameter `T`
+   |                         ^ cannot perform const operation using `T`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
 error[E0392]: parameter `T` is never used
   --> $DIR/issue-67375.rs:7:12
diff --git a/src/test/ui/const-generics/issue-67375.rs b/src/test/ui/const-generics/issue-67375.rs
index 994ec92cfb5..ecc76bcae06 100644
--- a/src/test/ui/const-generics/issue-67375.rs
+++ b/src/test/ui/const-generics/issue-67375.rs
@@ -7,7 +7,7 @@
 struct Bug<T> {
     //~^ ERROR parameter `T` is never used
     inner: [(); { [|_: &T| {}; 0].len() }],
-    //[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //[min]~^ ERROR generic parameters may not be used in const operations
     //[full]~^^ WARN cannot use constants which depend on generic parameters in types
     //[full]~^^^ WARN this was previously accepted by the compiler
 }
diff --git a/src/test/ui/const-generics/issue-67945-1.min.stderr b/src/test/ui/const-generics/issue-67945-1.min.stderr
index 949b5da5920..804236c30bd 100644
--- a/src/test/ui/const-generics/issue-67945-1.min.stderr
+++ b/src/test/ui/const-generics/issue-67945-1.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-67945-1.rs:14:16
    |
 LL |         let x: S = MaybeUninit::uninit();
-   |                ^ non-trivial anonymous constants must not depend on the parameter `S`
+   |                ^ cannot perform const operation using `S`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-67945-1.rs:17:45
    |
 LL |         let b = &*(&x as *const _ as *const S);
-   |                                             ^ non-trivial anonymous constants must not depend on the parameter `S`
+   |                                             ^ cannot perform const operation using `S`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
 error[E0392]: parameter `S` is never used
   --> $DIR/issue-67945-1.rs:11:12
diff --git a/src/test/ui/const-generics/issue-67945-1.rs b/src/test/ui/const-generics/issue-67945-1.rs
index d1a83e978d1..6771603f259 100644
--- a/src/test/ui/const-generics/issue-67945-1.rs
+++ b/src/test/ui/const-generics/issue-67945-1.rs
@@ -12,10 +12,10 @@ struct Bug<S> {
     //~^ ERROR parameter `S` is never used
     A: [(); {
         let x: S = MaybeUninit::uninit();
-        //[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+        //[min]~^ ERROR generic parameters may not be used in const operations
         //[full]~^^ ERROR mismatched types
         let b = &*(&x as *const _ as *const S);
-        //[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+        //[min]~^ ERROR generic parameters may not be used in const operations
         0
     }],
 }
diff --git a/src/test/ui/const-generics/issue-67945-2.min.stderr b/src/test/ui/const-generics/issue-67945-2.min.stderr
index ed445b3e8f7..2de942c1220 100644
--- a/src/test/ui/const-generics/issue-67945-2.min.stderr
+++ b/src/test/ui/const-generics/issue-67945-2.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-67945-2.rs:12:16
    |
 LL |         let x: S = MaybeUninit::uninit();
-   |                ^ non-trivial anonymous constants must not depend on the parameter `S`
+   |                ^ cannot perform const operation using `S`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-67945-2.rs:15:45
    |
 LL |         let b = &*(&x as *const _ as *const S);
-   |                                             ^ non-trivial anonymous constants must not depend on the parameter `S`
+   |                                             ^ cannot perform const operation using `S`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
 error[E0392]: parameter `S` is never used
   --> $DIR/issue-67945-2.rs:9:12
diff --git a/src/test/ui/const-generics/issue-67945-2.rs b/src/test/ui/const-generics/issue-67945-2.rs
index 7f789297df0..72dbb674e66 100644
--- a/src/test/ui/const-generics/issue-67945-2.rs
+++ b/src/test/ui/const-generics/issue-67945-2.rs
@@ -10,10 +10,10 @@ struct Bug<S> {
     //~^ ERROR parameter `S` is never used
     A: [(); {
         let x: S = MaybeUninit::uninit();
-        //[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+        //[min]~^ ERROR generic parameters may not be used in const operations
         //[full]~^^ ERROR mismatched types
         let b = &*(&x as *const _ as *const S);
-        //[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+        //[min]~^ ERROR generic parameters may not be used in const operations
         0
     }],
 }
diff --git a/src/test/ui/const-generics/issues/issue-61747.min.stderr b/src/test/ui/const-generics/issues/issue-61747.min.stderr
index fdd9a569748..b176f9d1c75 100644
--- a/src/test/ui/const-generics/issues/issue-61747.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-61747.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-61747.rs:8:30
    |
 LL |     fn successor() -> Const<{C + 1}> {
-   |                              ^ non-trivial anonymous constants must not depend on the parameter `C`
+   |                              ^ cannot perform const operation using `C`
    |
-   = help: it is currently only allowed to use either `C` or `{ C }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `C`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/const-generics/issues/issue-61747.rs b/src/test/ui/const-generics/issues/issue-61747.rs
index 4e5cde17f39..3a4dd1cdd18 100644
--- a/src/test/ui/const-generics/issues/issue-61747.rs
+++ b/src/test/ui/const-generics/issues/issue-61747.rs
@@ -7,7 +7,7 @@ struct Const<const N: usize>;
 impl<const C: usize> Const<{C}> {
     fn successor() -> Const<{C + 1}> {
         //[full]~^ ERROR constant expression depends on a generic parameter
-        //[min]~^^ ERROR generic parameters must not be used
+        //[min]~^^ ERROR generic parameters may not be used
         Const
     }
 }
diff --git a/src/test/ui/const-generics/issues/issue-61935.min.stderr b/src/test/ui/const-generics/issues/issue-61935.min.stderr
index f461a31eeae..9e31466259f 100644
--- a/src/test/ui/const-generics/issues/issue-61935.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-61935.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-61935.rs:10:23
    |
 LL |         Self:FooImpl<{N==0}>
-   |                       ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                       ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/const-generics/issues/issue-61935.rs b/src/test/ui/const-generics/issues/issue-61935.rs
index a181a8dabe5..9fa02329a71 100644
--- a/src/test/ui/const-generics/issues/issue-61935.rs
+++ b/src/test/ui/const-generics/issues/issue-61935.rs
@@ -9,7 +9,7 @@ impl<const N: usize> Foo for [(); N]
     where
         Self:FooImpl<{N==0}>
 //[full]~^ERROR constant expression depends on a generic parameter
-//[min]~^^ERROR generic parameters must not be used inside of non-trivial constant values
+//[min]~^^ERROR generic parameters may not be used in const operations
 {}
 
 trait FooImpl<const IS_ZERO: bool>{}
diff --git a/src/test/ui/const-generics/issues/issue-62220.min.stderr b/src/test/ui/const-generics/issues/issue-62220.min.stderr
index 84975e8f3be..3bd127ee74a 100644
--- a/src/test/ui/const-generics/issues/issue-62220.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-62220.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-62220.rs:8:59
    |
 LL | pub type TruncatedVector<T, const N: usize> = Vector<T, { N - 1 }>;
-   |                                                           ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                                           ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/const-generics/issues/issue-62220.rs b/src/test/ui/const-generics/issues/issue-62220.rs
index 5694dc6d04d..2017473fa9e 100644
--- a/src/test/ui/const-generics/issues/issue-62220.rs
+++ b/src/test/ui/const-generics/issues/issue-62220.rs
@@ -6,7 +6,7 @@
 pub struct Vector<T, const N: usize>([T; N]);
 
 pub type TruncatedVector<T, const N: usize> = Vector<T, { N - 1 }>;
-//[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
+//[min]~^ ERROR generic parameters may not be used in const operations
 
 impl<T, const N: usize> Vector<T, { N }> {
     /// Drop the last component and return the vector with one fewer dimension.
diff --git a/src/test/ui/const-generics/issues/issue-62456.min.stderr b/src/test/ui/const-generics/issues/issue-62456.min.stderr
index f94ba8c0c9b..c73f62a4a07 100644
--- a/src/test/ui/const-generics/issues/issue-62456.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-62456.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-62456.rs:7:20
    |
 LL |     let _ = [0u64; N + 1];
-   |                    ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                    ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/const-generics/issues/issue-62456.rs b/src/test/ui/const-generics/issues/issue-62456.rs
index 338ec42799d..cbb2a11a931 100644
--- a/src/test/ui/const-generics/issues/issue-62456.rs
+++ b/src/test/ui/const-generics/issues/issue-62456.rs
@@ -6,7 +6,7 @@
 fn foo<const N: usize>() {
     let _ = [0u64; N + 1];
     //[full]~^ ERROR constant expression depends on a generic parameter
-    //[min]~^^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //[min]~^^ ERROR generic parameters may not be used in const operations
 }
 
 fn main() {}
diff --git a/src/test/ui/const-generics/issues/issue-64494.min.stderr b/src/test/ui/const-generics/issues/issue-64494.min.stderr
index f712171bbac..8b02fd108bd 100644
--- a/src/test/ui/const-generics/issues/issue-64494.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-64494.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-64494.rs:16:38
    |
 LL | impl<T: Foo> MyTrait for T where Is<{T::VAL == 5}>: True {}
-   |                                      ^^^^^^ non-trivial anonymous constants must not depend on the parameter `T`
+   |                                      ^^^^^^ cannot perform const operation using `T`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-64494.rs:19:38
    |
 LL | impl<T: Foo> MyTrait for T where Is<{T::VAL == 6}>: True {}
-   |                                      ^^^^^^ non-trivial anonymous constants must not depend on the parameter `T`
+   |                                      ^^^^^^ cannot perform const operation using `T`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
 error[E0119]: conflicting implementations of trait `MyTrait`:
   --> $DIR/issue-64494.rs:19:1
diff --git a/src/test/ui/const-generics/issues/issue-64494.rs b/src/test/ui/const-generics/issues/issue-64494.rs
index b62ebf846d5..014742be03d 100644
--- a/src/test/ui/const-generics/issues/issue-64494.rs
+++ b/src/test/ui/const-generics/issues/issue-64494.rs
@@ -15,10 +15,10 @@ impl True for Is<{true}> {}
 
 impl<T: Foo> MyTrait for T where Is<{T::VAL == 5}>: True {}
 //[full]~^ ERROR constant expression depends on a generic parameter
-//[min]~^^ ERROR generic parameters must not be used inside of non-trivial constant values
+//[min]~^^ ERROR generic parameters may not be used in const operations
 impl<T: Foo> MyTrait for T where Is<{T::VAL == 6}>: True {}
 //[full]~^ ERROR constant expression depends on a generic parameter
-//[min]~^^ ERROR generic parameters must not be used inside of non-trivial constant values
+//[min]~^^ ERROR generic parameters may not be used in const operations
 //[min]~| ERROR conflicting implementations of trait `MyTrait`
 
 fn main() {}
diff --git a/src/test/ui/const-generics/issues/issue-66205.min.stderr b/src/test/ui/const-generics/issues/issue-66205.min.stderr
index a18126ccfef..282f72be6da 100644
--- a/src/test/ui/const-generics/issues/issue-66205.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-66205.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-66205.rs:8:14
    |
 LL |     fact::<{ N - 1 }>();
-   |              ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |              ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/const-generics/issues/issue-66205.rs b/src/test/ui/const-generics/issues/issue-66205.rs
index 668f49852e1..4e37c247d00 100644
--- a/src/test/ui/const-generics/issues/issue-66205.rs
+++ b/src/test/ui/const-generics/issues/issue-66205.rs
@@ -7,7 +7,7 @@
 fn fact<const N: usize>() {
     fact::<{ N - 1 }>();
     //[full]~^ ERROR constant expression depends on a generic parameter
-    //[min]~^^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //[min]~^^ ERROR generic parameters may not be used in const operations
 }
 
 fn main() {}
diff --git a/src/test/ui/const-generics/issues/issue-67739.min.stderr b/src/test/ui/const-generics/issues/issue-67739.min.stderr
index ba378de4156..35d97c46248 100644
--- a/src/test/ui/const-generics/issues/issue-67739.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-67739.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-67739.rs:12:30
    |
 LL |         [0u8; mem::size_of::<Self::Associated>()];
-   |                              ^^^^^^^^^^^^^^^^ non-trivial anonymous constants must not depend on the parameter `Self`
+   |                              ^^^^^^^^^^^^^^^^ cannot perform const operation using `Self`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/const-generics/issues/issue-67739.rs b/src/test/ui/const-generics/issues/issue-67739.rs
index 296e4d423c4..21d13de22eb 100644
--- a/src/test/ui/const-generics/issues/issue-67739.rs
+++ b/src/test/ui/const-generics/issues/issue-67739.rs
@@ -11,7 +11,7 @@ pub trait Trait {
     fn associated_size(&self) -> usize {
         [0u8; mem::size_of::<Self::Associated>()];
         //[full]~^ ERROR constant expression depends on a generic parameter
-        //[min]~^^ ERROR generic parameters must not be used inside of non-trivial constant values
+        //[min]~^^ ERROR generic parameters may not be used in const operations
         0
     }
 }
diff --git a/src/test/ui/const-generics/issues/issue-68366.min.stderr b/src/test/ui/const-generics/issues/issue-68366.min.stderr
index 73d6fec6f9b..b900a0d096a 100644
--- a/src/test/ui/const-generics/issues/issue-68366.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-68366.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-68366.rs:12:37
    |
 LL | impl <const N: usize> Collatz<{Some(N)}> {}
-   |                                     ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                     ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error[E0207]: the const parameter `N` is not constrained by the impl trait, self type, or predicates
   --> $DIR/issue-68366.rs:12:13
diff --git a/src/test/ui/const-generics/issues/issue-68366.rs b/src/test/ui/const-generics/issues/issue-68366.rs
index ac313eb3b2f..474cdb7258d 100644
--- a/src/test/ui/const-generics/issues/issue-68366.rs
+++ b/src/test/ui/const-generics/issues/issue-68366.rs
@@ -11,7 +11,7 @@ struct Collatz<const N: Option<usize>>;
 
 impl <const N: usize> Collatz<{Some(N)}> {}
 //~^ ERROR the const parameter
-//[min]~^^ generic parameters must not be used inside of non-trivial constant values
+//[min]~^^ generic parameters may not be used in const operations
 
 struct Foo;
 
diff --git a/src/test/ui/const-generics/issues/issue-68977.min.stderr b/src/test/ui/const-generics/issues/issue-68977.min.stderr
index 59d2be3ce4b..7828d859394 100644
--- a/src/test/ui/const-generics/issues/issue-68977.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-68977.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-68977.rs:29:17
    |
 LL |     PhantomU8<{(INT_BITS + FRAC_BITS + 7) / 8}>;
-   |                 ^^^^^^^^ non-trivial anonymous constants must not depend on the parameter `INT_BITS`
+   |                 ^^^^^^^^ cannot perform const operation using `INT_BITS`
    |
-   = help: it is currently only allowed to use either `INT_BITS` or `{ INT_BITS }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `INT_BITS`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-68977.rs:29:28
    |
 LL |     PhantomU8<{(INT_BITS + FRAC_BITS + 7) / 8}>;
-   |                            ^^^^^^^^^ non-trivial anonymous constants must not depend on the parameter `FRAC_BITS`
+   |                            ^^^^^^^^^ cannot perform const operation using `FRAC_BITS`
    |
-   = help: it is currently only allowed to use either `FRAC_BITS` or `{ FRAC_BITS }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `FRAC_BITS`
 
 error: aborting due to 2 previous errors
 
diff --git a/src/test/ui/const-generics/issues/issue-68977.rs b/src/test/ui/const-generics/issues/issue-68977.rs
index 49b305a5a78..4fea94cb465 100644
--- a/src/test/ui/const-generics/issues/issue-68977.rs
+++ b/src/test/ui/const-generics/issues/issue-68977.rs
@@ -27,8 +27,8 @@ fxp_storage_impls! {
 
 type FxpStorageHelper<const INT_BITS: u8, const FRAC_BITS: u8> =
     PhantomU8<{(INT_BITS + FRAC_BITS + 7) / 8}>;
-    //[min]~^ ERROR generic parameters must not be used inside of non-trivial constant values
-    //[min]~| ERROR generic parameters must not be used inside of non-trivial constant values
+    //[min]~^ ERROR generic parameters may not be used in const operations
+    //[min]~| ERROR generic parameters may not be used in const operations
 
 struct Fxp<const INT_BITS: u8, const FRAC_BITS: u8>
 where
diff --git a/src/test/ui/const-generics/issues/issue-72787.min.stderr b/src/test/ui/const-generics/issues/issue-72787.min.stderr
index a4c80b1d8c0..d960d9513b7 100644
--- a/src/test/ui/const-generics/issues/issue-72787.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-72787.min.stderr
@@ -1,34 +1,34 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-72787.rs:11:17
    |
 LL |     Condition<{ LHS <= RHS }>: True
-   |                 ^^^ non-trivial anonymous constants must not depend on the parameter `LHS`
+   |                 ^^^ cannot perform const operation using `LHS`
    |
-   = help: it is currently only allowed to use either `LHS` or `{ LHS }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `LHS`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-72787.rs:11:24
    |
 LL |     Condition<{ LHS <= RHS }>: True
-   |                        ^^^ non-trivial anonymous constants must not depend on the parameter `RHS`
+   |                        ^^^ cannot perform const operation using `RHS`
    |
-   = help: it is currently only allowed to use either `RHS` or `{ RHS }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `RHS`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-72787.rs:26:25
    |
 LL |     IsLessOrEqual<{ 8 - I }, { 8 - J }>: True,
-   |                         ^ non-trivial anonymous constants must not depend on the parameter `I`
+   |                         ^ cannot perform const operation using `I`
    |
-   = help: it is currently only allowed to use either `I` or `{ I }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `I`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-72787.rs:26:36
    |
 LL |     IsLessOrEqual<{ 8 - I }, { 8 - J }>: True,
-   |                                    ^ non-trivial anonymous constants must not depend on the parameter `J`
+   |                                    ^ cannot perform const operation using `J`
    |
-   = help: it is currently only allowed to use either `J` or `{ J }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `J`
 
 error[E0283]: type annotations needed
   --> $DIR/issue-72787.rs:22:26
diff --git a/src/test/ui/const-generics/issues/issue-72787.rs b/src/test/ui/const-generics/issues/issue-72787.rs
index 779c1d2950e..57572e23aa4 100644
--- a/src/test/ui/const-generics/issues/issue-72787.rs
+++ b/src/test/ui/const-generics/issues/issue-72787.rs
@@ -10,8 +10,8 @@ pub trait True {}
 impl<const LHS: u32, const RHS: u32> True for IsLessOrEqual<LHS, RHS> where
     Condition<{ LHS <= RHS }>: True
 //[full]~^ Error constant expression depends on a generic parameter
-//[min]~^^ Error generic parameters must not be used inside of non-trivial constant values
-//[min]~| Error generic parameters must not be used inside of non-trivial constant values
+//[min]~^^ Error generic parameters may not be used in const operations
+//[min]~| Error generic parameters may not be used in const operations
 {
 }
 impl True for Condition<true> {}
@@ -28,8 +28,8 @@ where
 //[full]~| constant expression depends on a generic parameter
 //[full]~| constant expression depends on a generic parameter
 //[full]~| constant expression depends on a generic parameter
-//[min]~^^^^^ Error generic parameters must not be used inside of non-trivial constant values
-//[min]~| Error generic parameters must not be used inside of non-trivial constant values
+//[min]~^^^^^ Error generic parameters may not be used in const operations
+//[min]~| Error generic parameters may not be used in const operations
     // Condition<{ 8 - I <= 8 - J }>: True,
 {
     fn print() {
diff --git a/src/test/ui/const-generics/issues/issue-72819-generic-in-const-eval.min.stderr b/src/test/ui/const-generics/issues/issue-72819-generic-in-const-eval.min.stderr
index afc14c7dcff..9fec3eb946d 100644
--- a/src/test/ui/const-generics/issues/issue-72819-generic-in-const-eval.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-72819-generic-in-const-eval.min.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-72819-generic-in-const-eval.rs:9:17
    |
 LL | where Assert::<{N < usize::max_value() / 2}>: IsTrue,
-   |                 ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                 ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/const-generics/issues/issue-72819-generic-in-const-eval.rs b/src/test/ui/const-generics/issues/issue-72819-generic-in-const-eval.rs
index 65c7f00a72a..6182042bde7 100644
--- a/src/test/ui/const-generics/issues/issue-72819-generic-in-const-eval.rs
+++ b/src/test/ui/const-generics/issues/issue-72819-generic-in-const-eval.rs
@@ -8,7 +8,7 @@
 struct Arr<const N: usize>
 where Assert::<{N < usize::max_value() / 2}>: IsTrue,
 //[full]~^ ERROR constant expression depends on a generic parameter
-//[min]~^^ ERROR generic parameters must not be used inside of non-trivial constant values
+//[min]~^^ ERROR generic parameters may not be used in const operations
 {
 }
 
diff --git a/src/test/ui/const-generics/issues/issue-76701-ty-param-in-const.min.stderr b/src/test/ui/const-generics/issues/issue-76701-ty-param-in-const.min.stderr
index 0db948d0a45..c10db84ea6e 100644
--- a/src/test/ui/const-generics/issues/issue-76701-ty-param-in-const.min.stderr
+++ b/src/test/ui/const-generics/issues/issue-76701-ty-param-in-const.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-76701-ty-param-in-const.rs:6:46
    |
 LL | fn ty_param<T>() -> [u8; std::mem::size_of::<T>()] {
-   |                                              ^ non-trivial anonymous constants must not depend on the parameter `T`
+   |                                              ^ cannot perform const operation using `T`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/issue-76701-ty-param-in-const.rs:12:42
    |
 LL | fn const_param<const N: usize>() -> [u8; N + 1] {
-   |                                          ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                          ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to 2 previous errors
 
diff --git a/src/test/ui/const-generics/issues/issue-76701-ty-param-in-const.rs b/src/test/ui/const-generics/issues/issue-76701-ty-param-in-const.rs
index 3c5bfb03f08..9051c36fe81 100644
--- a/src/test/ui/const-generics/issues/issue-76701-ty-param-in-const.rs
+++ b/src/test/ui/const-generics/issues/issue-76701-ty-param-in-const.rs
@@ -5,13 +5,13 @@
 
 fn ty_param<T>() -> [u8; std::mem::size_of::<T>()] {
     //[full]~^ ERROR constant expression depends on a generic parameter
-    //[min]~^^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //[min]~^^ ERROR generic parameters may not be used in const operations
     todo!()
 }
 
 fn const_param<const N: usize>() -> [u8; N + 1] {
     //[full]~^ ERROR constant expression depends on a generic parameter
-    //[min]~^^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //[min]~^^ ERROR generic parameters may not be used in const operations
     todo!()
 }
 
diff --git a/src/test/ui/const-generics/min_const_generics/complex-expression.rs b/src/test/ui/const-generics/min_const_generics/complex-expression.rs
index c6380f6394d..8257ffbf491 100644
--- a/src/test/ui/const-generics/min_const_generics/complex-expression.rs
+++ b/src/test/ui/const-generics/min_const_generics/complex-expression.rs
@@ -7,19 +7,19 @@ fn ok<const M: usize>() -> [u8; M] {
 }
 
 struct Break0<const N: usize>([u8; { N + 1 }]);
-//~^ ERROR generic parameters must not be used inside of non-trivial constant values
+//~^ ERROR generic parameters may not be used in const operations
 
 struct Break1<const N: usize>([u8; { { N } }]);
-//~^ ERROR generic parameters must not be used inside of non-trivial constant values
+//~^ ERROR generic parameters may not be used in const operations
 
 fn break2<const N: usize>() {
     let _: [u8; N + 1];
-    //~^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //~^ ERROR generic parameters may not be used in const operations
 }
 
 fn break3<const N: usize>() {
     let _ = [0; N + 1];
-    //~^ ERROR generic parameters must not be used inside of non-trivial constant values
+    //~^ ERROR generic parameters may not be used in const operations
 }
 
 trait Foo {
diff --git a/src/test/ui/const-generics/min_const_generics/complex-expression.stderr b/src/test/ui/const-generics/min_const_generics/complex-expression.stderr
index d8897f53d7f..73768ac03a4 100644
--- a/src/test/ui/const-generics/min_const_generics/complex-expression.stderr
+++ b/src/test/ui/const-generics/min_const_generics/complex-expression.stderr
@@ -1,34 +1,34 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/complex-expression.rs:9:38
    |
 LL | struct Break0<const N: usize>([u8; { N + 1 }]);
-   |                                      ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                      ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/complex-expression.rs:12:40
    |
 LL | struct Break1<const N: usize>([u8; { { N } }]);
-   |                                        ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                                        ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/complex-expression.rs:16:17
    |
 LL |     let _: [u8; N + 1];
-   |                 ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                 ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/complex-expression.rs:21:17
    |
 LL |     let _ = [0; N + 1];
-   |                 ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                 ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to 4 previous errors
 
diff --git a/src/test/ui/const-generics/min_const_generics/self-ty-in-const-1.stderr b/src/test/ui/const-generics/min_const_generics/self-ty-in-const-1.stderr
index 7dc81bf45af..64da5e07df2 100644
--- a/src/test/ui/const-generics/min_const_generics/self-ty-in-const-1.stderr
+++ b/src/test/ui/const-generics/min_const_generics/self-ty-in-const-1.stderr
@@ -1,10 +1,10 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/self-ty-in-const-1.rs:4:41
    |
 LL |     fn t1() -> [u8; std::mem::size_of::<Self>()];
-   |                                         ^^^^ non-trivial anonymous constants must not depend on the parameter `Self`
+   |                                         ^^^^ cannot perform const operation using `Self`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
 error: generic `Self` types are currently not permitted in anonymous constants
   --> $DIR/self-ty-in-const-1.rs:14:41
diff --git a/src/test/ui/const-generics/params-in-ct-in-ty-param-lazy-norm.min.stderr b/src/test/ui/const-generics/params-in-ct-in-ty-param-lazy-norm.min.stderr
index 0dd591d891f..39aa8087cec 100644
--- a/src/test/ui/const-generics/params-in-ct-in-ty-param-lazy-norm.min.stderr
+++ b/src/test/ui/const-generics/params-in-ct-in-ty-param-lazy-norm.min.stderr
@@ -6,13 +6,13 @@ LL | struct Bar<T = [u8; N], const N: usize>(T);
    |
    = note: using type defaults and const parameters in the same parameter list is currently not permitted
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/params-in-ct-in-ty-param-lazy-norm.rs:7:44
    |
 LL | struct Foo<T, U = [u8; std::mem::size_of::<T>()]>(T, U);
-   |                                            ^ non-trivial anonymous constants must not depend on the parameter `T`
+   |                                            ^ cannot perform const operation using `T`
    |
-   = note: type parameters are currently not permitted in anonymous constants
+   = note: type parameters may not be used in const expressions
 
 error: constant values inside of type parameter defaults must not depend on generic parameters
   --> $DIR/params-in-ct-in-ty-param-lazy-norm.rs:12:21
diff --git a/src/test/ui/const-generics/params-in-ct-in-ty-param-lazy-norm.rs b/src/test/ui/const-generics/params-in-ct-in-ty-param-lazy-norm.rs
index b9d74850f37..51f0cff3f21 100644
--- a/src/test/ui/const-generics/params-in-ct-in-ty-param-lazy-norm.rs
+++ b/src/test/ui/const-generics/params-in-ct-in-ty-param-lazy-norm.rs
@@ -6,7 +6,7 @@
 
 struct Foo<T, U = [u8; std::mem::size_of::<T>()]>(T, U);
 //[full]~^ ERROR constant values inside of type parameter defaults
-//[min]~^^ ERROR generic parameters must not be used inside of non-trivial
+//[min]~^^ ERROR generic parameters may not be used in const operations
 
 // FIXME(const_generics:defaults): We still don't know how to we deal with type defaults.
 struct Bar<T = [u8; N], const N: usize>(T);
diff --git a/src/test/ui/const-generics/wf-misc.min.stderr b/src/test/ui/const-generics/wf-misc.min.stderr
index 1c52d601749..935f12dd2c3 100644
--- a/src/test/ui/const-generics/wf-misc.min.stderr
+++ b/src/test/ui/const-generics/wf-misc.min.stderr
@@ -1,18 +1,18 @@
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/wf-misc.rs:9:17
    |
 LL |     let _: [u8; N + 1];
-   |                 ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                 ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
-error: generic parameters must not be used inside of non-trivial constant values
+error: generic parameters may not be used in const operations
   --> $DIR/wf-misc.rs:17:21
    |
 LL |     let _: Const::<{N + 1}>;
-   |                     ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |                     ^ cannot perform const operation using `N`
    |
-   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
 
 error: aborting due to 2 previous errors
 
diff --git a/src/test/ui/const-generics/wf-misc.rs b/src/test/ui/const-generics/wf-misc.rs
index f8c41404c46..103c580f28f 100644
--- a/src/test/ui/const-generics/wf-misc.rs
+++ b/src/test/ui/const-generics/wf-misc.rs
@@ -8,7 +8,7 @@
 pub fn arr_len<const N: usize>() {
     let _: [u8; N + 1];
     //[full]~^ ERROR constant expression depends on a generic parameter
-    //[min]~^^ ERROR generic parameters must not be used inside of non-trivial
+    //[min]~^^ ERROR generic parameters may not be used in const operations
 }
 
 struct Const<const N: usize>;
@@ -16,7 +16,7 @@ struct Const<const N: usize>;
 pub fn func_call<const N: usize>() {
     let _: Const::<{N + 1}>;
     //[full]~^ ERROR constant expression depends on a generic parameter
-    //[min]~^^ ERROR generic parameters must not be used inside of non-trivial
+    //[min]~^^ ERROR generic parameters may not be used in const operations
 }
 
 fn main() {}