provide suggestion for invalid boolean cast

Also, don't suggest comparing to zero for non-numeric expressions.
2019-01-09 16:57:49 -05:00 · 2019-01-09 16:57:49 -05:00 · 565c39de43
commit 565c39de43
parent 6ecad33838
7 changed files with 48 additions and 25 deletions
--- a/src/test/ui/error-codes/E0054.stderr
+++ b/src/test/ui/error-codes/E0054.stderr
@ -2,9 +2,7 @@ error[E0054]: cannot cast as `bool`
  --> $DIR/E0054.rs:3:24
   |
 LL |     let x_is_nonzero = x as bool; //~ ERROR E0054
-   |                        ^^^^^^^^^ unsupported cast
-   |
-   = help: compare with zero instead
+   |                        ^^^^^^^^^ help: compare with zero instead: `x != 0`

 error: aborting due to previous error