check that even referencing a TLS static during CTFE fails

Author: RalfJung

src/test/ui/consts/miri_unleashed/tls.rs

@@ -14,4 +14,11 @@ static TEST_BAD: () = {
     //~| NOTE cannot access thread local static
 };
 
+// Make sure we catch taking a reference to thread-local storage.
+static TEST_BAD_REF: () = {
+    unsafe { let _val = &A; }
+    //~^ ERROR could not evaluate static initializer
+    //~| NOTE cannot access thread local static
+};
+
 fn main() {}

src/test/ui/consts/miri_unleashed/tls.stderr

@@ -4,14 +4,25 @@ error[E0080]: could not evaluate static initializer
 LL |     unsafe { let _val = A; }
    |                         ^ cannot access thread local static (DefId(0:4 ~ tls[317d]::A[0]))
 
+error[E0080]: could not evaluate static initializer
+  --> $DIR/tls.rs:19:26
+   |
+LL |     unsafe { let _val = &A; }
+   |                          ^ cannot access thread local static (DefId(0:4 ~ tls[317d]::A[0]))
+
 warning: skipping const checks
    |
 help: skipping check that does not even have a feature gate
   --> $DIR/tls.rs:12:25
    |
 LL |     unsafe { let _val = A; }
    |                         ^
+help: skipping check that does not even have a feature gate
+  --> $DIR/tls.rs:19:26
+   |
+LL |     unsafe { let _val = &A; }
+   |                          ^
 
-error: aborting due to previous error; 1 warning emitted
+error: aborting due to 2 previous errors; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0080`.