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View Code? Open in Web Editor NEWTools for working with arrays in rust
Home Page: https://docs.rs/arraylib
License: MIT License
arraylib's Issues
miri errors on tests
cargo +nightly-2020-03-16 miri test fails on util::init::tests::drop_on_panic and util::init::tests::drop_on_fail tests with following errors:
`drop_on_panic`
error: Miri evaluation error: trying to reborrow for Unique, but parent tag <untagged> does not have an appropriate item in the borrow stack
--> /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/slice/mod.rs:5709:5
|
5709 | &mut *ptr::slice_from_raw_parts_mut(data, len)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ trying to reborrow for Unique, but parent tag <untagged> does not have an appropriate item in the borrow stack
|
note: inside call to `std::slice::from_raw_parts_mut::<std::mem::MaybeUninit<util::init::tests::DropCount>>` at src/util/init.rs:115:25
--> src/util/init.rs:115:25
|
115 | slice::from_raw_parts_mut(self.array_base_ptr, self.initialized_count)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: inside call to `<util::init::try_unfold_array::DropGuard<util::init::tests::DropCount> as std::ops::Drop>::drop` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ptr/mod.rs:177:1
note: inside call to `std::intrinsics::drop_in_place::<util::init::try_unfold_array::DropGuard<util::init::tests::DropCount>> - shim(Some(util::init::try_unfold_array::DropGuard<util::init::tests::DropCount>))` at src/util/init.rs:155:9
--> src/util/init.rs:155:9
|
155 | }
| ^
note: inside call to `util::init::try_unfold_array::<[util::init::tests::DropCount; 16], usize, [closure@src/util/init.rs:47:30: 51:6 f:&mut [closure@src/util/init.rs:27:23: 27:55 init:&mut [closure@src/util/init.rs:210:52: 216:14 counter:&std::sync::Mutex<usize>]]], std::convert::Infallible>` at src/util/init.rs:47:5
--> src/util/init.rs:47:5
|
47 | / try_unfold_array(0usize, |state| {
48 | | let item = f(*state);
49 | | *state += 1;
50 | | item
51 | | })
| |______^
note: inside call to `util::init::try_array_init_fn::<[util::init::tests::DropCount; 16], std::convert::Infallible, [closure@src/util/init.rs:27:23: 27:55 init:&mut [closure@src/util/init.rs:210:52: 216:14 counter:&std::sync::Mutex<usize>]]>` at src/util/init.rs:27:5
--> src/util/init.rs:27:5
|
27 | try_array_init_fn(|i| Ok::<_, Infallible>(init(i))).unwrap_or_else(|inf| match inf {})
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `util::init::array_init_fn::<[util::init::tests::DropCount; 16], [closure@src/util/init.rs:210:52: 216:14 counter:&std::sync::Mutex<usize>]>` at src/util/init.rs:210:38
--> src/util/init.rs:210:38
|
210 | let _: [DropCount; 16] = array_init_fn(|i| {
| ______________________________________^
211 | | if i == 10 {
212 | | panic!()
213 | | } else {
214 | | DropCount(&counter)
215 | | }
216 | | });
| |______________^
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:329:40
= note: inside call to `std::panicking::r#try::do_call::<[closure@src/util/init.rs:209:42: 217:10 counter:&std::sync::Mutex<usize>], ()>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:285:13
= note: inside call to `std::panicking::r#try::do_try` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:274:15
= note: inside call to `std::panicking::r#try::<(), [closure@src/util/init.rs:209:42: 217:10 counter:&std::sync::Mutex<usize>]>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:394:14
note: inside call to `std::panic::catch_unwind::<[closure@src/util/init.rs:209:42: 217:10 counter:&std::sync::Mutex<usize>], ()>` at src/util/init.rs:209:17
--> src/util/init.rs:209:17
|
209 | let r = std::panic::catch_unwind(|| {
| _________________^
210 | | let _: [DropCount; 16] = array_init_fn(|i| {
211 | | if i == 10 {
212 | | panic!()
... |
216 | | });
217 | | });
| |__________^
note: inside call to `util::init::tests::drop_on_panic` at src/util/init.rs:206:5
--> src/util/init.rs:206:5
|
206 | / fn drop_on_panic() {
207 | | let counter = Mutex::new(0);
208 | |
209 | | let r = std::panic::catch_unwind(|| {
... |
220 | | assert_eq!(*counter.lock().unwrap(), 10);
221 | | }
| |_____^
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:232:5
= note: inside call to `<[closure@src/util/init.rs:206:5: 221:6] as std::ops::FnOnce<()>>::call_once - shim` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:232:5
= note: inside call to `<fn() as std::ops::FnOnce<()>>::call_once - shim(fn())` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:518:5
= note: inside call to `test::__rust_begin_short_backtrace::<fn()>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:509:30
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:232:5
= note: inside call to `<[closure@DefId(14:631 ~ test[e807]::run_test[0]::{{closure}}[2]) 0:fn()] as std::ops::FnOnce<()>>::call_once - shim(vtable)` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/liballoc/boxed.rs:1017:9
= note: inside call to `<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send> as std::ops::FnOnce<()>>::call_once` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:318:9
= note: inside call to `<std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>> as std::ops::FnOnce<()>>::call_once` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:329:40
= note: inside call to `std::panicking::r#try::do_call::<std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>>, ()>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:285:13
= note: inside call to `std::panicking::r#try::do_try` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:274:15
= note: inside call to `std::panicking::r#try::<(), std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>>>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:394:14
= note: inside call to `std::panic::catch_unwind::<std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>>, ()>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:542:18
= note: inside call to `test::run_test_in_process` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:451:39
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:476:13
= note: inside call to `test::run_test::run_test_inner` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:506:28
= note: inside call to `test::run_test` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:285:13
= note: inside call to `test::run_tests::<[closure@DefId(14:230 ~ test[e807]::console[0]::run_tests_console[0]::{{closure}}[2]) 0:&mut test::console::ConsoleTestState, 1:&mut std::boxed::Box<dyn test::formatters::OutputFormatter>]>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/console.rs:280:5
= note: inside call to `test::run_tests_console` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:121:15
= note: inside call to `test::test_main` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:140:5
= note: inside call to `test::test_main_static`
= note: inside call to `main` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:67:34
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:52:73
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/sys_common/backtrace.rs:130:5
= note: inside call to `std::sys_common::backtrace::__rust_begin_short_backtrace::<[closure@DefId(1:6033 ~ std[1f88]::rt[0]::lang_start_internal[0]::{{closure}}[0]::{{closure}}[0]) 0:&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:52:13
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:329:40
= note: inside call to `std::panicking::r#try::do_call::<[closure@DefId(1:6032 ~ std[1f88]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:285:13
= note: inside call to `std::panicking::r#try::do_try` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:274:15
= note: inside call to `std::panicking::r#try::<i32, [closure@DefId(1:6032 ~ std[1f88]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe]>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:394:14
= note: inside call to `std::panic::catch_unwind::<[closure@DefId(1:6032 ~ std[1f88]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:51:25
= note: inside call to `std::rt::lang_start_internal` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:67:5
= note: inside call to `std::rt::lang_start::<()>`
= note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)
`drop_on_fail`
error: Miri evaluation error: trying to reborrow for Unique, but parent tag <untagged> does not have an appropriate item in the borrow stack
--> /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/slice/mod.rs:5709:5
|
5709 | &mut *ptr::slice_from_raw_parts_mut(data, len)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ trying to reborrow for Unique, but parent tag <untagged> does not have an appropriate item in the borrow stack
|
note: inside call to `std::slice::from_raw_parts_mut::<std::mem::MaybeUninit<util::init::tests::DropCount>>` at src/util/init.rs:115:25
--> src/util/init.rs:115:25
|
115 | slice::from_raw_parts_mut(self.array_base_ptr, self.initialized_count)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: inside call to `<util::init::try_unfold_array::DropGuard<util::init::tests::DropCount> as std::ops::Drop>::drop` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ptr/mod.rs:177:1
note: inside call to `std::intrinsics::drop_in_place::<util::init::try_unfold_array::DropGuard<util::init::tests::DropCount>> - shim(Some(util::init::try_unfold_array::DropGuard<util::init::tests::DropCount>))` at src/util/init.rs:155:9
--> src/util/init.rs:155:9
|
155 | }
| ^
note: inside call to `util::init::try_unfold_array::<[util::init::tests::DropCount; 16], usize, [closure@src/util/init.rs:47:30: 51:6 f:&mut [closure@src/util/init.rs:228:64: 234:10 counter:&std::sync::Mutex<usize>]], ()>` at src/util/init.rs:47:5
--> src/util/init.rs:47:5
|
47 | / try_unfold_array(0usize, |state| {
48 | | let item = f(*state);
49 | | *state += 1;
50 | | item
51 | | })
| |______^
note: inside call to `util::init::try_array_init_fn::<[util::init::tests::DropCount; 16], (), [closure@src/util/init.rs:228:64: 234:10 counter:&std::sync::Mutex<usize>]>` at src/util/init.rs:228:46
--> src/util/init.rs:228:46
|
228 | let r: Result<[DropCount; 16], ()> = try_array_init_fn(|i| {
| ______________________________________________^
229 | | if i == 10 {
230 | | Err(())
231 | | } else {
232 | | Ok(DropCount(&counter))
233 | | }
234 | | });
| |__________^
note: inside call to `util::init::tests::drop_on_fail` at src/util/init.rs:225:5
--> src/util/init.rs:225:5
|
225 | / fn drop_on_fail() {
226 | | let counter = Mutex::new(0);
227 | |
228 | | let r: Result<[DropCount; 16], ()> = try_array_init_fn(|i| {
... |
237 | | assert_eq!(*counter.lock().unwrap(), 10);
238 | | }
| |_____^
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:232:5
= note: inside call to `<[closure@src/util/init.rs:225:5: 238:6] as std::ops::FnOnce<()>>::call_once - shim` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:232:5
= note: inside call to `<fn() as std::ops::FnOnce<()>>::call_once - shim(fn())` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:518:5
= note: inside call to `test::__rust_begin_short_backtrace::<fn()>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:509:30
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:232:5
= note: inside call to `<[closure@DefId(14:631 ~ test[e807]::run_test[0]::{{closure}}[2]) 0:fn()] as std::ops::FnOnce<()>>::call_once - shim(vtable)` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/liballoc/boxed.rs:1017:9
= note: inside call to `<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send> as std::ops::FnOnce<()>>::call_once` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:318:9
= note: inside call to `<std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>> as std::ops::FnOnce<()>>::call_once` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:329:40
= note: inside call to `std::panicking::r#try::do_call::<std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>>, ()>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:285:13
= note: inside call to `std::panicking::r#try::do_try` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:274:15
= note: inside call to `std::panicking::r#try::<(), std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>>>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:394:14
= note: inside call to `std::panic::catch_unwind::<std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>>, ()>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:542:18
= note: inside call to `test::run_test_in_process` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:451:39
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:476:13
= note: inside call to `test::run_test::run_test_inner` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:506:28
= note: inside call to `test::run_test` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:285:13
= note: inside call to `test::run_tests::<[closure@DefId(14:230 ~ test[e807]::console[0]::run_tests_console[0]::{{closure}}[2]) 0:&mut test::console::ConsoleTestState, 1:&mut std::boxed::Box<dyn test::formatters::OutputFormatter>]>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/console.rs:280:5
= note: inside call to `test::run_tests_console` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:121:15
= note: inside call to `test::test_main` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libtest/lib.rs:140:5
= note: inside call to `test::test_main_static`
= note: inside call to `main` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:67:34
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:52:73
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/sys_common/backtrace.rs:130:5
= note: inside call to `std::sys_common::backtrace::__rust_begin_short_backtrace::<[closure@DefId(1:6033 ~ std[1f88]::rt[0]::lang_start_internal[0]::{{closure}}[0]::{{closure}}[0]) 0:&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:52:13
= note: inside call to closure at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:329:40
= note: inside call to `std::panicking::r#try::do_call::<[closure@DefId(1:6032 ~ std[1f88]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:285:13
= note: inside call to `std::panicking::r#try::do_try` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:274:15
= note: inside call to `std::panicking::r#try::<i32, [closure@DefId(1:6032 ~ std[1f88]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe]>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:394:14
= note: inside call to `std::panic::catch_unwind::<[closure@DefId(1:6032 ~ std[1f88]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:51:25
= note: inside call to `std::rt::lang_start_internal` at /home/waffle/.rustup/toolchains/nightly-2020-03-16-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:67:5
= note: inside call to `std::rt::lang_start::<()>`
= note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)
In both cases, the error is caused by try_unfold_array::DropGuard::drop.
The error seems to be because of aliasing, but I don't understand where is the first reference to the slice...
It also seems that array-init (where I've stolen the idea of try_unfold_array method from) does not have the same issue (the same drop/fail tests for array-init: gist).
I don't understand what am I doing wrong, so I would appreciate if somebody with more experience in unsafe code will help.
Run miri on doctests
Currently, miri doesn't run doctests (see rust-lang/miri#584) however, a lot of functionality of this lib is tested only in doctests.
It makes sense either to copy-paste doctests to unit tests (under #[cfg(miri)]?) or, at least, run them locally.
Code deduplication
Currently, there are 5 methods in Array to create an array:
unfold/try_unfoldfrom_fn/try_from_fnfrom_iter
All of them are implemented either by util::init module or by specialization for sizes 0..=32 (see local_macros.rs and array.rs). This was done to achieve the best performance.
However, all of these methods can be implemented in terms of try_unfold. And this would probably be zero cost if compiler is smart enough.
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