miri test error: Undefined Behavior #34
Description
How to:
cargo miri test
Error:
test error::tests::parse_int_error ... ok
test error::tests::try_from_int_error ... ok
test int::cmp::tests::cmp ... ok
test int::fmt::tests::debug ... error: Undefined Behavior: attempting a write access using <146320> at alloc41000[0x4b], but that tag does not exist in the borrow stack for this location
--> src/fmt.rs:117:13
|
117 | ptr::copy_nonoverlapping(lut_ptr.offset(d1), buf_ptr.offset(curr), 2);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| attempting a write access using <146320> at alloc41000[0x4b], but that tag does not exist in the borrow stack for this location
| this error occurs as part of an access at alloc41000[0x4b..0x4d]
|
= help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
= help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
help: <146320> was created by a SharedReadWrite retag at offsets [0x0..0x1]
--> src/fmt.rs:94:19
|
94 | let buf_ptr = &mut buf[0] as *mut _ as *mut u8;
| ^^^^^^^^^^^
= note: BACKTRACE (of the first span):
= note: inside `fmt::fmt_u256` at src/fmt.rs:117:13: 117:82
note: inside `int::fmt::<impl core::fmt::Display for int::I256>::fmt`
--> src/macros/fmt.rs:42:17
|
42 | $crate::fmt::fmt_u256(n, is_nonnegative, f)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
::: src/int/fmt.rs:5:1
|
5 | / impl_fmt! {
6 | | impl Fmt for I256;
7 | | }
| |_- in this macro invocation
note: inside `int::fmt::<impl core::fmt::Debug for int::I256>::fmt`
--> src/macros/fmt.rs:25:21
|
25 | ::core::fmt::Display::fmt(self, f)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
::: src/int/fmt.rs:5:1