| //@revisions: stack tree tree_iwrites |
| //@[tree]compile-flags: -Zmiri-tree-borrows |
| //@[tree_iwrites]compile-flags: -Zmiri-tree-borrows -Zmiri-tree-borrows-implicit-writes |
| use std::mem; |
| |
| fn safe(x: &i32, y: &mut i32) { |
| //~[stack]^ ERROR: protect |
| //~[tree_iwrites]^^ ERROR: /Undefined Behavior: reborrow through .* at .* is forbidden/ |
| let _v = *x; |
| *y = 2; //~[tree] ERROR: /write access through .* is forbidden/ |
| } |
| |
| fn main() { |
| let mut x = 0; |
| let xref = &mut x; |
| let xraw: *mut i32 = unsafe { mem::transmute_copy(&xref) }; |
| let xshr = &*xref; |
| // transmute fn ptr around so that we can avoid retagging |
| let safe_raw: fn(x: *const i32, y: *mut i32) = |
| unsafe { mem::transmute::<fn(&i32, &mut i32), _>(safe) }; |
| safe_raw(xshr, xraw); |
| } |
