feat: no_std

[DaniPopes]

Motivation

Make ruint no_std-compatible.

Supersedes #260.

Solution

See original description in #260.
Since core::error::Error is unstable, we instead implement the formatting using core::fmt and gate impl std::error::Error with #[cfg(feature = "std")]

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog

[codecov]

Codecov Report

Patch coverage: 13.20% and project coverage change: -0.59% ⚠️

Comparison is base (4b04138) 83.37% compared to head (5538096) 82.79%.

❗ Current head 5538096 differs from pull request most recent head 558af3e. Consider uploading reports for the commit 558af3e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #274      +/-   ##
==========================================
- Coverage   83.37%   82.79%   -0.59%     
==========================================
  Files          52       52              
  Lines        5541     5585      +44     
==========================================
+ Hits         4620     4624       +4     
- Misses        921      961      +40     

Files Changed	Coverage Δ
ruint-macro/src/lib.rs	96.42% <ø> (ø)
src/algorithms/div/knuth.rs	100.00% <ø> (ø)
src/algorithms/div/reciprocal.rs	100.00% <ø> (ø)
src/algorithms/gcd/matrix.rs	93.54% <ø> (ø)
src/bit_arr.rs	21.35% <ø> (ø)
src/bytes.rs	96.71% <ø> (ø)
src/lib.rs	81.05% <ø> (ø)
src/log.rs	84.16% <ø> (ø)
src/pow.rs	93.20% <ø> (ø)
src/root.rs	100.00% <ø> (ø)
... and 9 more

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[DaniPopes]

Coverage is actually unchanged because it didn't count code generated by the thiserror macro

[prestwich]

lgtm