src/test/ui/ptr-coercion.rs

   1 // Test coercions between pointers which don't do anything fancy like unsizing.
   2 // These are testing that we don't lose mutability when converting to raw pointers.
   3
   4 pub fn main() {
   5     // *const -> *mut
   6     let x: *const isize = &42;
   7     let x: *mut isize = x; //~  ERROR mismatched types
   8                            //~| expected raw pointer `*mut isize`
   9                            //~| found raw pointer `*const isize`
  10                            //~| types differ in mutability
  11
  12     // & -> *mut
  13     let x: *mut isize = &42; //~  ERROR mismatched types
  14                              //~| expected raw pointer `*mut isize`
  15                              //~| found reference `&isize`
  16                              //~| types differ in mutability
  17
  18     let x: *const isize = &42;
  19     let x: *mut isize = x; //~  ERROR mismatched types
  20                            //~| expected raw pointer `*mut isize`
  21                            //~| found raw pointer `*const isize`
  22                            //~| types differ in mutability
  23 }