resim build failing on mac os with unstablefeatures

[iamfaiz123]

i am trying to build simulator on my mac os and getting errors

81  | |                             .copy_to_nonoverlapping(ptr, digit::$Digit::BYTES as usize);
    | |_______________________________________________________________________________________^
...
225 |   crate::macro_impl!(endian);
    |   -------------------------- in this macro invocation
    |
    = help: add `#![feature(const_intrinsic_copy)]` to the crate attributes to enable
    = note: this error originates in the macro `endian` which comes from the expansion of the macro `crate::macro_impl` (in Nightly builds, run with -Z macro-backtrace for more info)

error: `core::ptr::const_ptr::<impl *const T>::copy_to_nonoverlapping` is not yet stable as a const fn
   --> /Users/rapidinnovation/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bnum-0.7.0/src/bint/endian.rs:131:25
    |
131 | /                         slice_ptr
132 | |                             .add(i << digit::$Digit::BYTE_SHIFT)
133 | |                             .copy_to_nonoverlapping(ptr, digit::$Digit::BYTES as usize);
    | |_______________________________________________________________________________________^
...
225 |   crate::macro_impl!(endian);
    |   -------------------------- in this macro invocation
    |
    = help: add `#![feature(const_intrinsic_copy)]` to the crate attributes to enable
    = note: this error originates in the macro `endian` which comes from the expansion of the macro `crate::macro_impl` (in Nightly builds, run with -Z macro-backtrace for more info)

   Compiling prettyplease v0.2.16
   Compiling bitflags v1.3.2
error: `core::ptr::const_ptr::<impl *const T>::copy_to_nonoverlapping` is not yet stable as a const fn
   --> /Users/rapidinnovation/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bnum-0.7.0/src/buint/mod.rs:145:17
    |
145 |                 digits_ptr.copy_to_nonoverlapping(uninit_ptr.add(n), N - n);
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
665 | crate::main_impl!(mod_impl);
    | --------------------------- in this macro invocation
    |
    = help: add `#![feature(const_intrinsic_copy)]` to the crate attributes to enable
    = note: this error originates in the macro `mod_impl` which comes from the expansion of the macro `crate::main_impl` (in Nightly builds, run with -Z macro-backtrace for more info)

error: `core::ptr::const_ptr::<impl *const T>::copy_to_nonoverlapping` is not yet stable as a const fn
   --> /Users/rapidinnovation/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bnum-0.7.0/src/buint/mod.rs:146:17
    |
146 |                 digits_ptr.add(N - n).copy_to_nonoverlapping(uninit_ptr, n);
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
665 | crate::main_impl!(mod_impl);
    | --------------------------- in this macro invocation
    |
    = help: add `#![feature(const_intrinsic_copy)]` to the crate attributes to enable
    = note: this error originates in the macro `mod_impl` which comes from the expansion of the macro `crate::main_impl` (in Nightly builds, run with -Z macro-backtrace for more info)

error: `core::ptr::const_ptr::<impl *const T>::copy_to_nonoverlapping` is not yet stable as a const fn
   --> /Users/rapidinnovation/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bnum-0.7.0/src/buint/mod.rs:388:17
    |
388 |                 u.digits.as_ptr().copy_to_nonoverlapping(out.digits.as_ptr().cast_mut().add(digit_shift), num_copies); // TODO: can change to out.digits.as_mut_ptr() when const_mut_refs is stabilised
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
665 | crate::main_impl!(mod_impl);
    | --------------------------- in this macro invocation
    |
    = help: add `#![feature(const_intrinsic_copy)]` to the crate attributes to enable
    = note: this error originates in the macro `mod_impl` which comes from the expansion of the macro `crate::main_impl` (in Nightly builds, run with -Z macro-backtrace for more info)

error: `core::ptr::const_ptr::<impl *const T>::copy_to_nonoverlapping` is not yet stable as a const fn
   --> /Users/rapidinnovation/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bnum-0.7.0/src/buint/mod.rs:414:17
    |
414 |                 u.digits.as_ptr().add(digit_shift).copy_to_nonoverlapping(out.digits.as_ptr().cast_mut(), num_copies); // TODO: can change to out.digits.as_mut_ptr() when const_mut_refs is stabilised
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
665 | crate::main_impl!(mod_impl);
    | --------------------------- in this macro invocation
    |
    = help: add `#![feature(const_intrinsic_copy)]` to the crate attributes to enable
    = note: this error originates in the macro `mod_impl` which comes from the expansion of the macro `crate::main_impl` (in Nightly builds, run with -Z macro-backtrace for more info)

   Compiling regex-syntax v0.7.5
error: `core::ptr::const_ptr::<impl *const T>::copy_to_nonoverlapping` is not yet stable as a const fn
   --> /Users/rapidinnovation/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bnum-0.7.0/src/buint/endian.rs:76:25
    |
76  | /                         slice_ptr
77  | |                             .add(len - digit::$Digit::BYTES as usize - (i << digit::$Digit::BYTE_SHIFT))
78  | |                             .copy_to_nonoverlapping(ptr, digit::$Digit::BYTES as usize);
    | |_______________________________________________________________________________________^
...
305 |   crate::macro_impl!(endian);
    |   -------------------------- in this macro invocation
    |
    = help: add `#![feature(const_intrinsic_copy)]` to the crate attributes to enable
    = note: this error originates in the macro `endian` which comes from the expansion of the macro `crate::macro_impl` (in Nightly builds, run with -Z macro-backtrace for more info)

error: `core::ptr::const_ptr::<impl *const T>::copy_to_nonoverlapping` is not yet stable as a const fn
   --> /Users/rapidinnovation/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bnum-0.7.0/src/buint/endian.rs:142:25
    |
142 | /                         slice_ptr
143 | |                             .add(i << digit::$Digit::BYTE_SHIFT)
144 | |                             .copy_to_nonoverlapping(ptr, digit::$Digit::BYTES as usize);
    | |_______________________________________________________________________________________^
...
305 |   crate::macro_impl!(endian);
    |   -------------------------- in this macro invocation
    |
    = help: add `#![feature(const_intrinsic_copy)]` to the crate attributes to enable
    = note: this error originates in the macro `endian` which comes from the expansion of the macro `crate::macro_impl` (in Nightly builds, run with -Z macro-backtrace for more info)```

[iamyulong]

Hi there, this seems to be a problem with rust 1.79.0-nightly. You can solve this by switching to a stable rust.

We are also addressing this problem as part of #1762.