add test for rust-lang#62878

Author: lcnr

src/test/ui/const-generics/issues/issue-62878.rs

@@ -0,0 +1,11 @@
+#![feature(const_generics)] //~ WARN the feature `const_generics` is incomplete
+
+fn foo<const N: usize, const A: [u8; N]>() {}
+//~^ ERROR the type of const parameters must not
+
+fn main() {
+    foo::<_, {[1]}>();
+    //~^ ERROR wrong number of const arguments
+    //~| ERROR wrong number of type arguments
+    //~| ERROR mismatched types
+}

src/test/ui/const-generics/issues/issue-62878.stderr

@@ -0,0 +1,37 @@
+error[E0770]: the type of const parameters must not depend on other generic parameters
+  --> $DIR/issue-62878.rs:3:38
+   |
+LL | fn foo<const N: usize, const A: [u8; N]>() {}
+   |                                      ^ the type must not depend on the parameter `N`
+
+warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/issue-62878.rs:1:12
+   |
+LL | #![feature(const_generics)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+
+error[E0107]: wrong number of const arguments: expected 2, found 1
+  --> $DIR/issue-62878.rs:7:5
+   |
+LL |     foo::<_, {[1]}>();
+   |     ^^^^^^^^^^^^^^^ expected 2 const arguments
+
+error[E0107]: wrong number of type arguments: expected 0, found 1
+  --> $DIR/issue-62878.rs:7:11
+   |
+LL |     foo::<_, {[1]}>();
+   |           ^ unexpected type argument
+
+error[E0308]: mismatched types
+  --> $DIR/issue-62878.rs:7:15
+   |
+LL |     foo::<_, {[1]}>();
+   |               ^^^ expected `usize`, found array `[{integer}; 1]`
+
+error: aborting due to 4 previous errors; 1 warning emitted
+
+Some errors have detailed explanations: E0107, E0308, E0770.
+For more information about an error, try `rustc --explain E0107`.