Add a second regression test

src/test/ui/const-generics/type_mismatch.rs

@@ -0,0 +1,9 @@
+fn foo<const N: usize>() -> [u8; N] {
+    bar::<N>() //~ ERROR mismatched types
+}
+
+fn bar<const N: u8>() -> [u8; N] {}
+//~^ ERROR mismatched types
+//~| ERROR mismatched types
+
+fn main() {}

src/test/ui/const-generics/type_mismatch.stderr

@@ -0,0 +1,23 @@
+error[E0308]: mismatched types
+  --> $DIR/type_mismatch.rs:2:11
+   |
+LL |     bar::<N>()
+   |           ^ expected `u8`, found `usize`
+
+error[E0308]: mismatched types
+  --> $DIR/type_mismatch.rs:5:31
+   |
+LL | fn bar<const N: u8>() -> [u8; N] {}
+   |                               ^ expected `usize`, found `u8`
+
+error[E0308]: mismatched types
+  --> $DIR/type_mismatch.rs:5:26
+   |
+LL | fn bar<const N: u8>() -> [u8; N] {}
+   |    ---                   ^^^^^^^ expected array `[u8; N]`, found `()`
+   |    |
+   |    implicitly returns `()` as its body has no tail or `return` expression
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0308`.