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Remove UB in test_ptr_subtraction test

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This commit is contained in:
Konrad Borowski 2019-02-17 13:04:48 +01:00
parent 3281e62188
commit 0cf1a912e3
1 changed files with 4 additions and 2 deletions
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6
src/libcore/tests/ptr.rs
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@ -207,7 +207,6 @@ fn test_ptr_addition() {
} }
#[test] #[test]
#[cfg(not(miri))] // This test performs invalid OOB pointer arithmetic
fn test_ptr_subtraction() { fn test_ptr_subtraction() {
unsafe { unsafe {
let xs = vec![0,1,2,3,4,5,6,7,8,9]; let xs = vec![0,1,2,3,4,5,6,7,8,9];
@ -223,8 +222,11 @@ fn test_ptr_subtraction() {
let m_start = xs_mut.as_mut_ptr(); let m_start = xs_mut.as_mut_ptr();
let mut m_ptr = m_start.offset(9); let mut m_ptr = m_start.offset(9);
while m_ptr >= m_start { loop {
*m_ptr += *m_ptr; *m_ptr += *m_ptr;
if m_ptr == m_start {
break;
}
m_ptr = m_ptr.offset(-1); m_ptr = m_ptr.offset(-1);
} }