Rollup merge of #76514 - hameerabbasi:const-generics-revs, r=lcnr

Add revisions to const generic issue UI tests.

Fixes #75279.

I have gotten into the flow, so I can do more of these if requested. I'm looking for feedback as to whether my work is on the right track so far.

src/test/ui/const-generics/auxiliary/const_generic_lib.rs

@@ -1,4 +1,6 @@
-#![feature(const_generics)]
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
 
 pub struct Struct<const N: usize>(pub [u8; N]);
 

src/test/ui/const-generics/auxiliary/impl-const.rs

@@ -1,4 +1,6 @@
-#![feature(const_generics)]
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
 
 pub struct Num<const N: usize>;
 

src/test/ui/const-generics/const-argument-cross-crate-mismatch.stderr → src/test/ui/const-generics/const-argument-cross-crate-mismatch.full.stderr

@@ -1,11 +1,11 @@
 error[E0308]: mismatched types
-  --> $DIR/const-argument-cross-crate-mismatch.rs:6:67
+  --> $DIR/const-argument-cross-crate-mismatch.rs:7:67
    |
 LL |     let _ = const_generic_lib::function(const_generic_lib::Struct([0u8, 1u8]));
    |                                                                   ^^^^^^^^^^ expected an array with a fixed size of 3 elements, found one with 2 elements
 
 error[E0308]: mismatched types
-  --> $DIR/const-argument-cross-crate-mismatch.rs:8:65
+  --> $DIR/const-argument-cross-crate-mismatch.rs:9:65
    |
 LL |     let _: const_generic_lib::Alias = const_generic_lib::Struct([0u8, 1u8, 2u8]);
    |                                                                 ^^^^^^^^^^^^^^^ expected an array with a fixed size of 2 elements, found one with 3 elements

src/test/ui/const-generics/const-argument-cross-crate-mismatch.min.stderr

@@ -0,0 +1,15 @@
+error[E0308]: mismatched types
+  --> $DIR/const-argument-cross-crate-mismatch.rs:7:67
+   |
+LL |     let _ = const_generic_lib::function(const_generic_lib::Struct([0u8, 1u8]));
+   |                                                                   ^^^^^^^^^^ expected an array with a fixed size of 3 elements, found one with 2 elements
+
+error[E0308]: mismatched types
+  --> $DIR/const-argument-cross-crate-mismatch.rs:9:65
+   |
+LL |     let _: const_generic_lib::Alias = const_generic_lib::Struct([0u8, 1u8, 2u8]);
+   |                                                                 ^^^^^^^^^^^^^^^ expected an array with a fixed size of 2 elements, found one with 3 elements
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0308`.

src/test/ui/const-generics/const-argument-cross-crate-mismatch.rs

@@ -1,4 +1,5 @@
 // aux-build:const_generic_lib.rs
+// revisions: full min
 
 extern crate const_generic_lib;
 

src/test/ui/const-generics/const-argument-cross-crate.rs

@@ -1,4 +1,5 @@
 // run-pass
+// revisions: full min
 // aux-build:const_generic_lib.rs
 
 extern crate const_generic_lib;

src/test/ui/const-generics/defaults/complex-unord-param.min.stderr

@@ -0,0 +1,8 @@
+error: type parameters must be declared prior to const parameters
+  --> $DIR/complex-unord-param.rs:9:41
+   |
+LL | struct NestedArrays<'a, const N: usize, A: 'a, const M: usize, T:'a =u32> {
+   |                    ---------------------^----------------------^--------- help: reorder the parameters: lifetimes, then types, then consts: `<'a, A: 'a, T: 'a, const N: usize, const M: usize>`
+
+error: aborting due to previous error
+

src/test/ui/const-generics/defaults/complex-unord-param.rs

@@ -1,11 +1,13 @@
-// run-pass
+// [full] run-pass
+// revisions: full min
 // Checks a complicated usage of unordered params
-
-#![feature(const_generics)]
-#![allow(incomplete_features)]
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
 #![allow(dead_code)]
 
 struct NestedArrays<'a, const N: usize, A: 'a, const M: usize, T:'a =u32> {
+  //[min]~^ ERROR type parameters must be declared prior to const parameters
   args: &'a [&'a [T; M]; N],
   specifier: A,
 }

src/test/ui/const-generics/defaults/intermixed-lifetime.stderr → src/test/ui/const-generics/defaults/intermixed-lifetime.full.stderr

@@ -1,11 +1,11 @@
 error: lifetime parameters must be declared prior to const parameters
-  --> $DIR/intermixed-lifetime.rs:6:28
+  --> $DIR/intermixed-lifetime.rs:7:28
    |
 LL | struct Foo<const N: usize, 'a, T = u32>(&'a (), T);
    |           -----------------^^---------- help: reorder the parameters: lifetimes, then consts and types: `<'a, const N: usize, T>`
 
 error: lifetime parameters must be declared prior to type parameters
-  --> $DIR/intermixed-lifetime.rs:9:37
+  --> $DIR/intermixed-lifetime.rs:11:37
    |
 LL | struct Bar<const N: usize, T = u32, 'a>(&'a (), T);
    |           --------------------------^^- help: reorder the parameters: lifetimes, then consts and types: `<'a, const N: usize, T>`

src/test/ui/const-generics/defaults/intermixed-lifetime.min.stderr

@@ -0,0 +1,26 @@
+error: lifetime parameters must be declared prior to const parameters
+  --> $DIR/intermixed-lifetime.rs:7:28
+   |
+LL | struct Foo<const N: usize, 'a, T = u32>(&'a (), T);
+   |           -----------------^^---------- help: reorder the parameters: lifetimes, then types, then consts: `<'a, T, const N: usize>`
+
+error: type parameters must be declared prior to const parameters
+  --> $DIR/intermixed-lifetime.rs:7:32
+   |
+LL | struct Foo<const N: usize, 'a, T = u32>(&'a (), T);
+   |           ---------------------^------- help: reorder the parameters: lifetimes, then types, then consts: `<'a, T, const N: usize>`
+
+error: lifetime parameters must be declared prior to const parameters
+  --> $DIR/intermixed-lifetime.rs:11:37
+   |
+LL | struct Bar<const N: usize, T = u32, 'a>(&'a (), T);
+   |           --------------------------^^- help: reorder the parameters: lifetimes, then types, then consts: `<'a, T, const N: usize>`
+
+error: type parameters must be declared prior to const parameters
+  --> $DIR/intermixed-lifetime.rs:11:28
+   |
+LL | struct Bar<const N: usize, T = u32, 'a>(&'a (), T);
+   |           -----------------^----------- help: reorder the parameters: lifetimes, then types, then consts: `<'a, T, const N: usize>`
+
+error: aborting due to 4 previous errors
+

src/test/ui/const-generics/defaults/intermixed-lifetime.rs

@@ -1,12 +1,16 @@
+// revisions: full min
 // Checks that lifetimes cannot be interspersed between consts and types.
-
-#![feature(const_generics)]
-#![allow(incomplete_features)]
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
 
 struct Foo<const N: usize, 'a, T = u32>(&'a (), T);
 //~^ Error lifetime parameters must be declared prior to const parameters
+//[min]~^^ Error type parameters must be declared prior to const parameters
 
 struct Bar<const N: usize, T = u32, 'a>(&'a (), T);
-//~^ Error lifetime parameters must be declared prior to type parameters
+//[full]~^ Error lifetime parameters must be declared prior to type parameters
+//[min]~^^ Error type parameters must be declared prior to const parameters
+//[min]~| Error lifetime parameters must be declared prior to const parameters
 
 fn main() {}

src/test/ui/const-generics/defaults/simple-defaults.min.stderr

@@ -0,0 +1,8 @@
+error: type parameters must be declared prior to const parameters
+  --> $DIR/simple-defaults.rs:9:40
+   |
+LL | struct FixedOutput<'a, const N: usize, T=u32> {
+   |                   ---------------------^----- help: reorder the parameters: lifetimes, then types, then consts: `<'a, T, const N: usize>`
+
+error: aborting due to previous error
+

src/test/ui/const-generics/defaults/simple-defaults.rs

@@ -1,10 +1,13 @@
-// run-pass
+// [full] run-pass
+// revisions: min full
 // Checks some basic test cases for defaults.
-#![feature(const_generics)]
-#![allow(incomplete_features)]
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
 #![allow(dead_code)]
 
 struct FixedOutput<'a, const N: usize, T=u32> {
+  //[min]~^ ERROR type parameters must be declared prior to const parameters
   out: &'a [T; N],
 }
 

src/test/ui/const-generics/issues/auxiliary/const_generic_issues_lib.rs

@@ -1,4 +1,6 @@
-#![feature(const_generics)]
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
 
 // All of these three items must be in `lib2` to reproduce the error
 

src/test/ui/const-generics/issues/issue-61935.full.stderr

@@ -0,0 +1,10 @@
+error: constant expression depends on a generic parameter
+  --> $DIR/issue-61935.rs:10:14
+   |
+LL |         Self:FooImpl<{N==0}>
+   |              ^^^^^^^^^^^^^^^
+   |
+   = note: this may fail depending on what value the parameter takes
+
+error: aborting due to previous error
+

src/test/ui/const-generics/issues/issue-61935.min.stderr

@@ -0,0 +1,10 @@
+error: generic parameters must not be used inside of non trivial constant values
+  --> $DIR/issue-61935.rs:10:23
+   |
+LL |         Self:FooImpl<{N==0}>
+   |                       ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |
+   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+
+error: aborting due to previous error
+

src/test/ui/const-generics/issues/issue-61935.rs

@@ -1,12 +1,15 @@
-#![feature(const_generics)]
-//~^ WARN the feature `const_generics` is incomplete
+// revisions: full min
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
 
 trait Foo {}
 
 impl<const N: usize> Foo for [(); N]
     where
         Self:FooImpl<{N==0}>
-//~^ERROR constant expression depends on a generic parameter
+//[full]~^ERROR constant expression depends on a generic parameter
+//[min]~^^ERROR generic parameters must not be used inside of non trivial constant values
 {}
 
 trait FooImpl<const IS_ZERO: bool>{}

src/test/ui/const-generics/issues/issue-62187-encountered-polymorphic-const.rs

@@ -1,7 +1,9 @@
 // run-pass
 
-#![feature(const_generics)]
-//~^ WARN the feature `const_generics` is incomplete
+// revisions: full min
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
 
 pub trait BitLen: Sized {
     const BIT_LEN: usize;
@@ -12,5 +14,5 @@ impl<const L: usize> BitLen for [u8; L] {
 }
 
 fn main() {
-    let foo = <[u8; 2]>::BIT_LEN; //~ WARN unused variable
+    let _foo = <[u8; 2]>::BIT_LEN;
 }

src/test/ui/const-generics/issues/issue-62220.stderr → src/test/ui/const-generics/issues/issue-62220.full.stderr

@@ -1,5 +1,5 @@
 error: constant expression depends on a generic parameter
-  --> $DIR/issue-62220.rs:10:27
+  --> $DIR/issue-62220.rs:13:27
    |
 LL |     pub fn trunc(self) -> (TruncatedVector<T, { N }>, T) {
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/test/ui/const-generics/issues/issue-62220.min.stderr

@@ -0,0 +1,10 @@
+error: generic parameters must not be used inside of non trivial constant values
+  --> $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`
+   |
+   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+
+error: aborting due to previous error
+

src/test/ui/const-generics/issues/issue-62220.rs

@@ -1,14 +1,17 @@
-#![allow(incomplete_features)]
-#![feature(const_generics)]
+// revisions: full min
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
 
 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
 
 impl<T, const N: usize> Vector<T, { N }> {
     /// Drop the last component and return the vector with one fewer dimension.
     pub fn trunc(self) -> (TruncatedVector<T, { N }>, T) {
-        //~^ ERROR constant expression depends on a generic parameter
+        //[full]~^ ERROR constant expression depends on a generic parameter
         unimplemented!()
     }
 }

src/test/ui/const-generics/issues/issue-62456.full.stderr

@@ -0,0 +1,10 @@
+error: constant expression depends on a generic parameter
+  --> $DIR/issue-62456.rs:7:20
+   |
+LL |     let _ = [0u64; N + 1];
+   |                    ^^^^^
+   |
+   = note: this may fail depending on what value the parameter takes
+
+error: aborting due to previous error
+

src/test/ui/const-generics/issues/issue-62456.min.stderr

@@ -0,0 +1,10 @@
+error: generic parameters must not be used inside of non trivial constant values
+  --> $DIR/issue-62456.rs:7:20
+   |
+LL |     let _ = [0u64; N + 1];
+   |                    ^ non-trivial anonymous constants must not depend on the parameter `N`
+   |
+   = help: it is currently only allowed to use either `N` or `{ N }` as generic constants
+
+error: aborting due to previous error
+

src/test/ui/const-generics/issues/issue-62456.rs

@@ -1,9 +1,12 @@
-#![feature(const_generics)]
-//~^ WARN the feature `const_generics` is incomplete
+// revisions: full min
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
 
 fn foo<const N: usize>() {
     let _ = [0u64; N + 1];
-    //~^ ERROR constant expression depends on a generic parameter
+    //[full]~^ ERROR constant expression depends on a generic parameter
+    //[min]~^^ ERROR generic parameters must not be used inside of non trivial constant values
 }
 
 fn main() {}

src/test/ui/const-generics/issues/issue-62504.stderr → src/test/ui/const-generics/issues/issue-62504.full.stderr

@@ -1,5 +1,5 @@
 error: constant expression depends on a generic parameter
-  --> $DIR/issue-62504.rs:18:25
+  --> $DIR/issue-62504.rs:19:25
    |
 LL |         ArrayHolder([0; Self::SIZE])
    |                         ^^^^^^^^^^

src/test/ui/const-generics/issues/issue-62504.min.stderr

@@ -0,0 +1,10 @@
+error: generic parameters must not be used inside of non trivial constant values
+  --> $DIR/issue-62504.rs:19:25
+   |
+LL |         ArrayHolder([0; Self::SIZE])
+   |                         ^^^^^^^^^^ non-trivial anonymous constants must not depend on the parameter `Self`
+   |
+   = help: it is currently only allowed to use either `Self` or `{ Self }` as generic constants
+
+error: aborting due to previous error
+