Build fails when using v0.7.0

[L3g73]

I've tried updating my malachite dependency to v0.7.0 but now I can no longer build:

error: no rules expected keyword `const`
    --> [...]\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\malachite-nz-0.7.0\src\natural\arithmetic\mul\fft.rs:4720:31
     |
4720 |                   assert_eq!(k, const { $n - 1 });
     |                                 ^^^^^ no rules expected this token in macro call
...
5664 | / process_crt!(
5665 | |     process_crt_7_6_5,
5666 | |     7,
5667 | |     6,
...    |
5674 | |     multi_sub_6
5675 | | );
     | |_- in this macro invocation
     |
note: while trying to match meta-variable `$right:expr`
    --> [...]\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib/rustlib/src/rust\library\core\src\macros\mod.rs:43:18
     |
43   |     ($left:expr, $right:expr $(,)?) => {
     |                  ^^^^^^^^^^^
     = note: this error originates in the macro `big_mul` which comes from the expansion of the macro `process_crt` (in Nightly builds, run with -Z macro-backtrace for more info)

[mhogrefe]

Inline const expressions were introduced in Rust 1.79.0, so you must be using an older version. Could you try upgrading to a more recent version of Rust?

[L3g73]

Huh, according to rustc --version i was using Rust 1.89.0, but after updating to 1.90.0 everything works fine now 😅
Sorry to bother you, have a nice day and thank you for your work on malachite 😄

[mhogrefe]

You're welcome! Don't worry about it, I definitely want to hear when people are having issues using Malachite.

[james-conn]

@mhogrefe

Inline const expressions were introduced in Rust 1.79.0

Although inline const expressions were indeed introduced in 1.79, there was a bug that caused inline const expressions to break when inside of macros from the standard library (such as assert_eq!, see rust-lang/rust#133081). This seems to have been fixed when the Rust edition of the standard library was bumped to 2024 in 1.87 (see rust-lang/rust#138162).

@L3g73

i was using Rust 1.89.0, but after updating to 1.90.0 everything works fine now

I'm not sure why this was broken in 1.89, so maybe there's something else I'm missing? Regardless, I think the MSRV of the crates should be bumped. Cargo's dependency resolution is MSRV-aware, so setting MSRV correctly prevents future users from encountering this issue.

malachite/Cargo.toml

Line 7 in bdfd652

rust-version = "1.86.0"

In theory the MSRV should be set to 1.87, but since @L3g73 is reporting that it's still broken until 1.90 maybe it is best to bump the MSRV to 1.90 just to be cautious.