| //@revisions: stack tree none |
| //@[tree]compile-flags: -Zmiri-tree-borrows |
| //@[none]compile-flags: -Zmiri-disable-stacked-borrows |
| #![feature(custom_mir, core_intrinsics)] |
| use std::intrinsics::mir::*; |
| |
| pub struct S(i32); |
| |
| #[custom_mir(dialect = "runtime", phase = "optimized")] |
| fn main() { |
| mir! { |
| let _unit: (); |
| { |
| let non_copy = S(42); |
| let ptr = std::ptr::addr_of_mut!(non_copy); |
| // This could change `non_copy` in-place |
| Call(_unit = change_arg(Move(*ptr), ptr), ReturnTo(after_call), UnwindContinue()) |
| } |
| after_call = { |
| Return() |
| } |
| |
| } |
| } |
| |
| pub fn change_arg(mut x: S, ptr: *mut S) { |
| x.0 = 0; |
| // If `x` got passed in-place, we'd see the write through `ptr`! |
| // Make sure we are not allowed to do that read. |
| unsafe { ptr.read() }; |
| //~[stack]^ ERROR: not granting access |
| //~[tree]| ERROR: /read access .* forbidden/ |
| //~[none]| ERROR: uninitialized |
| } |
