error[E0308]: mismatched types
  --> $DIR/static-mut-bad-types.rs:5:13
   |
LL | static mut a: isize = 3;
   |               ----- expected due to this type
...
LL |         a = true;
   |             ^^^^ expected `isize`, found `bool`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.