Add ui test cast-array-issue-138836

Signed-off-by: xizheyin <[email protected]>

Author: xizheyin

Diff for: tests/ui/cast/cast-array-issue-138836.rs

@@ -0,0 +1,5 @@
+fn main() {
+    let a: [u8; 3] = [1,2,3];
+    let b = &a;
+    let c = b as *const [u32; 3]; //~ ERROR mismatched types [E0308]
+}

Diff for: tests/ui/cast/cast-array-issue-138836.stderr

@@ -0,0 +1,12 @@
+error[E0308]: mismatched types
+  --> $DIR/cast-array-issue-138836.rs:4:13
+   |
+LL |     let c = b as *const [u32; 3];
+   |             ^^^^^^^^^^^^^^^^^^^^ expected `[u8; 3]`, found `[u32; 3]`
+   |
+   = note: expected array `[u8; 3]`
+              found array `[u32; 3]`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.