For some reason, on my linux box, using `-Zverbose` here is causing a linker failure.

Rather than try to work out what was happening, I just removed the flag because
I see no reason for it to be on this test.

src/test/ui/nll/constant.rs

@@ -11,7 +11,7 @@
 // Test that MIR borrowck and NLL analysis can handle constants of
 // arbitrary types without ICEs.
 
-// compile-flags:-Zborrowck=mir -Zverbose
+// compile-flags:-Zborrowck=mir
 // compile-pass
 
 const HI: &str = "hi";