`malachite-bigint` feature failing to compile

I'm using `aarch64-apple-darwin` and running the following commands:

```bash
cargo new demo
cd demo
cargo add rustpython-parser --features malachite-bigint --no-default-features
cargo run
```

and am getting the following errors:

<details>
<summary>Error output</summary>

```bash
error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:3:5
 |
3 | num::{
 | ^^^ could not find `num` in `malachite`

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:3:5
 |
3 | num::{
 | ^^^ could not find `num` in `malachite`

error[E0432]: unresolved import `malachite::rounding_modes`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:10:5
 |
10 | rounding_modes::RoundingMode,
 | ^^^^^^^^^^^^^^ could not find `rounding_modes` in `malachite`

error[E0432]: unresolved import `malachite::rounding_modes`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:10:5
 |
10 | rounding_modes::RoundingMode,
 | ^^^^^^^^^^^^^^ could not find `rounding_modes` in `malachite`

 Compiling unicode_names2_generator v1.3.0
 Compiling rustpython-parser v0.4.0
error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:294:34
 |
294 | let exp = malachite::num::conversion::traits::SaturatingFrom::saturating_from(&rhs.0);
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:109:1
 |
109 | forward_pow_biguint!(BigInt);
 | ---------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this trait
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::conversion::traits::SaturatingFrom;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:295:30
 |
295 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(lhs.0, exp).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:109:1
 |
109 | forward_pow_biguint!(BigInt);
 | ---------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:305:32
 |
305 | malachite::num::conversion::traits::SaturatingFrom::saturating_from(&rhs.0);
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:109:1
 |
109 | forward_pow_biguint!(BigInt);
 | ---------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this trait
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::conversion::traits::SaturatingFrom;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:306:34
 |
306 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(&lhs.0, exp).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:109:1
 |
109 | forward_pow_biguint!(BigInt);
 | ---------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:317:32
 |
317 | malachite::num::conversion::traits::SaturatingFrom::saturating_from(&rhs.0);
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:109:1
 |
109 | forward_pow_biguint!(BigInt);
 | ---------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this trait
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::conversion::traits::SaturatingFrom;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:318:34
 |
318 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(lhs.0, exp).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:109:1
 |
109 | forward_pow_biguint!(BigInt);
 | ---------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:329:32
 |
329 | malachite::num::conversion::traits::SaturatingFrom::saturating_from(&rhs.0);
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:109:1
 |
109 | forward_pow_biguint!(BigInt);
 | ---------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this trait
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::conversion::traits::SaturatingFrom;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:330:34
 |
330 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(&lhs.0, exp).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:109:1
 |
109 | forward_pow_biguint!(BigInt);
 | ---------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:277:30
 |
277 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(lhs.0, rhs as _).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:135:1
 |
135 | apply_to_unsigneds!(forward_pow_primitive{BigInt, _});
 | ----------------------------------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_primitive` which comes from the expansion of the macro `apply_to_unsigneds` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:280:30
 |
280 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(&lhs.0, rhs as _).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:135:1
 |
135 | apply_to_unsigneds!(forward_pow_primitive{BigInt, _});
 | ----------------------------------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_primitive` which comes from the expansion of the macro `apply_to_unsigneds` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:283:30
 |
283 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(lhs.0, *rhs as _).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:135:1
 |
135 | apply_to_unsigneds!(forward_pow_primitive{BigInt, _});
 | ----------------------------------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_primitive` which comes from the expansion of the macro `apply_to_unsigneds` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:286:30
 |
286 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(&lhs.0, *rhs as _).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:135:1
 |
135 | apply_to_unsigneds!(forward_pow_primitive{BigInt, _});
 | ----------------------------------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_primitive` which comes from the expansion of the macro `apply_to_unsigneds` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:210:37
 |
210 | Self(<Integer as malachite::num::basic::traits::Zero>::ZERO)
 | ^^^ could not find `num` in `malachite`
 |
help: consider importing this module
 |
1 + use malachite::base::num::basic::traits;
 |
help: if you import `traits`, refer to it directly
 |
210 - Self(<Integer as malachite::num::basic::traits::Zero>::ZERO)
210 + Self(<Integer as traits::Zero>::ZERO)
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:222:37
 |
222 | Self(<Integer as malachite::num::basic::traits::One>::ONE)
 | ^^^ could not find `num` in `malachite`
 |
help: consider importing this module
 |
1 + use malachite::base::num::basic::traits;
 |
help: if you import `traits`, refer to it directly
 |
222 - Self(<Integer as malachite::num::basic::traits::One>::ONE)
222 + Self(<Integer as traits::One>::ONE)
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/bigint.rs:516:32
 |
516 | match <_ as malachite::num::arithmetic::traits::Sign>::sign(&self.0) {
 | ^^^ could not find `num` in `malachite`
 |
help: consider importing this module
 |
1 + use malachite::base::num::arithmetic::traits;
 |
help: if you import `traits`, refer to it directly
 |
516 - match <_ as malachite::num::arithmetic::traits::Sign>::sign(&self.0) {
516 + match <_ as traits::Sign>::sign(&self.0) {
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:294:34
 |
294 | let exp = malachite::num::conversion::traits::SaturatingFrom::saturating_from(&rhs.0);
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:82:1
 |
82 | forward_pow_biguint!(BigUint);
 | ----------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this trait
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:1:1
 |
1 + use malachite::base::num::conversion::traits::SaturatingFrom;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:295:30
 |
295 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(lhs.0, exp).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:82:1
 |
82 | forward_pow_biguint!(BigUint);
 | ----------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:305:32
 |
305 | malachite::num::conversion::traits::SaturatingFrom::saturating_from(&rhs.0);
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:82:1
 |
82 | forward_pow_biguint!(BigUint);
 | ----------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this trait
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:1:1
 |
1 + use malachite::base::num::conversion::traits::SaturatingFrom;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:306:34
 |
306 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(&lhs.0, exp).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:82:1
 |
82 | forward_pow_biguint!(BigUint);
 | ----------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:317:32
 |
317 | malachite::num::conversion::traits::SaturatingFrom::saturating_from(&rhs.0);
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:82:1
 |
82 | forward_pow_biguint!(BigUint);
 | ----------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this trait
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:1:1
 |
1 + use malachite::base::num::conversion::traits::SaturatingFrom;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:318:34
 |
318 | <_ as malachite::num::arithmetic::traits::Pow<u64>>::pow(lhs.0, exp).into()
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:82:1
 |
82 | forward_pow_biguint!(BigUint);
 | ----------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this module
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:1:1
 |
1 + use malachite::base::num::arithmetic::traits;
 |

error[E0433]: failed to resolve: could not find `num` in `malachite`
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/macros.rs:329:32
 |
329 | malachite::num::conversion::traits::SaturatingFrom::saturating_from(&rhs.0);
 | ^^^ could not find `num` in `malachite`
 |
 ::: /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:82:1
 |
82 | forward_pow_biguint!(BigUint);
 | ----------------------------- in this macro invocation
 |
 = note: this error originates in the macro `forward_pow_biguint` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this trait
 --> /Users/oscar/.cargo/registry/src/index.crates.io-6f17d22bba15001f/malachite-bigint-0.2.0/src/biguint.rs:1:1
 |
1 + use malachite::base::num::conversion::traits::SaturatingFrom;
 |

... truncated so it can fit on GitHub ...
```

</details>

The issue seems to be with the `malachite-bigint` feature which also happens to be a default feature so `cargo add rustpython-parser` has the same issue.

This issue can be worked around by using the alternative bigint feature (`cargo add rustpython-parser --no-default-features --features num-bigint`).

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`malachite-bigint` feature failing to compile #130

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malachite-bigint feature failing to compile #130

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`malachite-bigint` feature failing to compile #130