Closed
Description
ndarray 0.9.1 compiles with rustc 1.61.0 but not with rustc 1.64.0-nightly (2f3ddd9 2022-06-27).
Code
Put this into a Cargo.toml of a new project:
[package]
name = "test-ndarray"
version = "0.1.0"
edition = "2021"
[dependencies]
ndarray = "0.9.1"rustc stable <= 1.61.0 compiles the crate fine, rustc nightly gives the following error:
error[E0716]: temporary value dropped while borrowed
--> .cargo/registry/src/github.com-1ecc6299db9ec823/ndarray-0.9.1/src/layout/layoutfmt.rs:29:24
|
25 | .format_with(" | ", |i, f| {
| - has type `&mut dyn FnMut(&'1 (dyn std::fmt::Display + '1)) -> Result<(), std::fmt::Error>`
...
29 | f(&format_args!("0x{:x}", i))
| ---^^^^^^^^^^^^^^^^^^^^^^^^^-
| | |
| | creates a temporary which is freed while still in use
| argument requires that borrow lasts for `'1`
30 | }
| - temporary value is freed at the end of this statement
|
= note: this error originates in the macro `format_args` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0597]: `i` does not live long enough
--> .cargo/registry/src/github.com-1ecc6299db9ec823/ndarray-0.9.1/src/layout/layoutfmt.rs:29:47
|
25 | .format_with(" | ", |i, f| {
| - has type `&mut dyn FnMut(&'1 (dyn std::fmt::Display + '1)) -> Result<(), std::fmt::Error>`
...
29 | f(&format_args!("0x{:x}", i))
| --------------------------^--
| | |
| | borrowed value does not live long enough
| argument requires that `i` is borrowed for `'1`
30 | }
31 | }))
| - `i` dropped here while still borrowed
|
= note: this error originates in the macro `format_args` (in Nightly builds, run with -Z macro-backtrace for more info)
Some errors have detailed explanations: E0597, E0716.
For more information about an error, try `rustc --explain E0597`.
error: could not compile `ndarray` due to 2 previous errors
Version it worked on
$ rustc --version --verbose
rustc 1.61.0 (fe5b13d68 2022-05-18)
binary: rustc
commit-hash: fe5b13d681f25ee6474be29d748c65adcd91f69e
commit-date: 2022-05-18
host: x86_64-unknown-linux-gnu
release: 1.61.0
LLVM version: 14.0.0
Version with regression
$ rustc +nightly --version --verbose
rustc 1.64.0-nightly (2f3ddd9f5 2022-06-27)
binary: rustc
commit-hash: 2f3ddd9f594adf9773547aa7cedb43c4ac8ffd2f
commit-date: 2022-06-27
host: x86_64-unknown-linux-gnu
release: 1.64.0-nightly
LLVM version: 14.0.6
@rustbot modify labels: +regression-from-stable-to-nightly -regression-untriaged