0.8.0

[kevinmehall]

New Features

• #[cache_left_rec] annotation to allow left recursion (Add left recursion support for rules without args #266)
• Return matched token/character from [ ] pattern expression (How to match and return a one char? #234)

Fixes

• Fix Rust grammar for arguments (Allow scoping in rule arguments #261) and type bounds (Trait bounds in parameters #279)
• Fix trace feature when using infix!{} (Compilation failure with --features peg/trace #277)
• Fix #[cache] with grammar lifetime parameters
• Allow clippy::redundant_closure_call lint in generated grammar (Clippy warnings after upgrade to 0.7 #258)

Breaking changes

Most users will not require changes to upgrade from 0.7 to 0.8; these only affect advanced use cases.

• Allow only lifetime, not type, parameters at the grammar level. (type parameters were never properly supported)
• Add 'input lifetime parameter to ParseElem trait so implementations can return tokens by reference. (ParseElem missing lifetime specifiers #268)
• Require Copy on ParseElem::Element to better represent the expectation that they are cheap to copy/move.

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Contributors: @kevinmehall @zsol @neunenak @fgasperij

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This discussion was created from the release 0.8.0.