Update lalrpop requirement from 0.20.0 to 0.21.0

[dependabot]

Updates the requirements on lalrpop to permit the latest version.

Changelog

Sourced from lalrpop's changelog.

0.21.0 (2024-05-30)

Since the last release, a fair number of the commits have been focused on cleaning up and improving LALRPOP's documentation. Shout out to Yudai Takada, George White, and Dinu Blanovschi.

Features

• LALRPOP now throws an error in more cases where it would previously just write out an error message and exit.
• lalrpop::process_src is now the recommended function to use in build.rs files. Previously the documentation incorrectly suggested that lalrpop::process_root looked in ./src instead of .

Bugfixes

• A long-standing bug where LALRPOP would throw a "no entry found for key" exception when trying to handle certain grammars has been resolved.
• LALRPOP will stop expanding macros infinitely during build time via a new macro_expansion_limit.

Compatibility note

Adding a limit to the number of times that LALRPOP will attempt to expand a macro is technically a breaking change. However, the default limit of 200 should be more than enough for the grammars we are currently aware of (which almost always need a limit of less than 5). This limit is customizable via Configuration::set_macro_expansion_limit.

If you have a grammar that uses a significant amount of macro expansion steps, we would be very interested in a PR that adds it to the test suite.

0.20.2 (2024-02-**)

Special thanks to our newest maintainers, Daniel Burgener and Patrick LaFontaine for helping to coordinate this release.

Features

• Lalrpop no longer depends on the is-terminal crate (thanks to Kmeakin!)
• Better performance with the default lexer using the underlying regex-automata crate (thanks to QuarticCat!)
• Allow the catch-all _ case for token matching can now be set to a higher precedence in match (thanks to fpoli!)
• Fewer clippy lints triggered in generated code
• Lalrpop now traverses symlinks to find .lalrpop files(thanks mbid!)
• Lalrpop now supports block comments including nestings(thanks seanbright!)

Bugfixes

• Lalrpop now uses the ascii-aware space regex when the unicode feature is not enabled (thanks to QuarticCat!)
• Dangling symlinks in crate no longer cause build failure (thanks to legeana

... (truncated)

Commits

• fa15b3e Cut a 0.21.0 release (#903)
• d5f12b4 update doc links in README.md (#933)
• 7dde3e3 Process src nits (#929)
• e8d02fe Add a new process_src() public helper to look in the source directory. (#911)
• f7debe8 Fix clippy issues in new nightly 1.82. (#928)
• a0da94d Rebase and fix of #670 Fix token_to_integer to not require Copyable (#918)
• fd0f280 Lint on calls to process::exit() (#923)
• 9c4b4f5 Fix comment about conflict detection (#925)
• 980d601 Don't call exit() in a library, instead return an error to the user (#920)
• 786e2fe Bump bit-set to 0.6 (#922)
• Additional commits viewable in compare view

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[dependabot]

Superseded by #476.