Build(deps): bump peg from 0.5.7 to 0.6.0

[dependabot-preview]

Bumps peg from 0.5.7 to 0.6.0.

Release notes

Sourced from peg's releases.

0.6.0

Major improvements

• Replaced build script integration and nightly-only syntax extension with a procedural macro that works on stable Rust. This means that errors both in the PEG grammar and the Rust code embedded from it are reported with source position by rustc. It even works with RLS!
• Add the ability to parse non-str input by implementing traits. It comes with an implementation for [T] (including [u8]), but you can define the traits for your own types. In fact, the rust-peg grammar is parsed with rust-peg via an implementation for token trees from proc-macro2.
• Add precedence!{} block for adding a precedence-climbing expression parser integrated with the surrounding PEG source.
• Report errors in left-recursive rules that would cause infinte loops.
• Allow rules to accept value and type parameters, including passing closures to replace the template syntax.
• Significant performance improvement for input that parses successfully by deferring error handling until parsing has failed.

Upgrade from 0.5.x

1. Remove peg = "0.5" from [build_dependencies] in Cargo.toml, and add peg = "0.6" under [dependencies].
2. If nothing else is in build.rs, delete it and remove build = "build.rs" from Cargo.toml
3. If using the 2015 edition of Rust, add extern crate peg; to your crate root.
4. Move your grammar from a separate .rustpeg file into a Rust source file. Remove the
   mod somename { include!(...) } and replace it with:

peg::parser!(grammar somename() for str {
    // grammar goes here
}

5. Add the rule keyword and parentheses to rule declarations.
   • foo = ... becomes rule foo = ...
   • pub bar -> X = ... becomes pub rule bar() -> X = ....
6. Add parentheses to expressions that invoke another rule.
7. Replace the character set syntax with the pattern matching syntax.
   • [a-zA-Z] becomes ['a'..='z' | 'A'..='Z'].
8. If your grammar used templates, replace them with rule arguments.
9. Replace
   • . with [_].
   • #position with position!()
   • #quiet<e> with quiet!{e}
   • #expected("foo") with expected!("foo").

Commits

• 4156871 Lock exact versions of internal crates
• c08ff13 Don't test bootstrap on nightly to avoid rustfmt breakage
• 04774f0 Move documentation to rustdoc
• d7bf226 Add test for mismatched action return type
• f7dd29f Fix trace feature
• 8d530e8 Merge peg-syntax-ext and peg-codegen crates into peg-macros
• 7bc597e Add a syntax to capture span information in precedence!{} blocks
• c78edc0 Emit only "duplicate rule" error message, not duplicate rules themselves
• b8a45aa Add parameters to rule functions
• 8b17f4d Special case rules _, __, ___ to be called without parentheses
• Additional commits viewable in compare view

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Superseded by #154.