15 lines
682 B
Rust
15 lines
682 B
Rust
// Make sure we cannot use raw ptrs that got transmuted from mutable references
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// (i.e, no EscapeToRaw happened).
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// We could, in principle, do EscapeToRaw lazily to allow this code, but that
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// would no alleviate the need for EscapeToRaw (see `ref_raw_int_raw` in
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// `run-pass/stacked-borrows.rs`), and thus increase overall complexity.
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use std::mem;
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fn main() {
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let mut x: [i32; 2] = [42, 43];
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let _raw: *mut i32 = unsafe { mem::transmute(&mut x[0]) };
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// `raw` still carries a tag, so we get another pointer to the same location that does not carry a tag
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let raw = (&mut x[1] as *mut i32).wrapping_offset(-1);
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unsafe { *raw = 13; } //~ ERROR borrow stack
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}
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