bless privacy tests (only diagnostic duplication)

Author: oli-obk

tests/ui/const-generics/generic_const_exprs/eval-privacy.rs

@@ -15,6 +15,7 @@ where
 {
     type AssocTy = Const<{ my_const_fn(U) }>;
     //~^ ERROR private type
+    //~| ERROR private type
     fn assoc_fn() -> Self::AssocTy {
         Const
     }

tests/ui/const-generics/generic_const_exprs/eval-privacy.stderr

@@ -7,6 +7,17 @@ LL |     type AssocTy = Const<{ my_const_fn(U) }>;
 LL | const fn my_const_fn(val: u8) -> u8 {
    | ----------------------------------- `fn(u8) -> u8 {my_const_fn}` declared as private
 
-error: aborting due to 1 previous error
+error[E0446]: private type `fn(u8) -> u8 {my_const_fn}` in public interface
+  --> $DIR/eval-privacy.rs:16:5
+   |
+LL |     type AssocTy = Const<{ my_const_fn(U) }>;
+   |     ^^^^^^^^^^^^ can't leak private type
+...
+LL | const fn my_const_fn(val: u8) -> u8 {
+   | ----------------------------------- `fn(u8) -> u8 {my_const_fn}` declared as private
+   |
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0446`.

tests/ui/privacy/where-priv-type.rs

@@ -74,6 +74,7 @@ where
 {
     type AssocTy = Const<{ my_const_fn(U) }>;
     //~^ ERROR private type
+    //~| ERROR private type
     fn assoc_fn() -> Self::AssocTy {
         Const
     }

tests/ui/privacy/where-priv-type.stderr

@@ -77,6 +77,17 @@ LL |     type AssocTy = Const<{ my_const_fn(U) }>;
 LL | const fn my_const_fn(val: u8) -> u8 {
    | ----------------------------------- `fn(u8) -> u8 {my_const_fn}` declared as private
 
-error: aborting due to 1 previous error; 5 warnings emitted
+error[E0446]: private type `fn(u8) -> u8 {my_const_fn}` in public interface
+  --> $DIR/where-priv-type.rs:75:5
+   |
+LL |     type AssocTy = Const<{ my_const_fn(U) }>;
+   |     ^^^^^^^^^^^^ can't leak private type
+...
+LL | const fn my_const_fn(val: u8) -> u8 {
+   | ----------------------------------- `fn(u8) -> u8 {my_const_fn}` declared as private
+   |
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+error: aborting due to 2 previous errors; 5 warnings emitted
 
 For more information about this error, try `rustc --explain E0446`.