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# Changelog
## v0.20.1 (May 2, 2023)
## v0.20.0 (April 27, 2023)
- Bump syn to version 2, courtesy of @jonasbb [#227](https://github.com/TedDriggs/darling/issues/227)
### Breaking Changes
- Replace all occurrences of syn::NestedMeta with darling::ast::NestedMeta.
- Replacement for the deprecated AttributeArgs:
```rust
// Before
parse_macro_input!(args as AttributeArgs);
// After
match NestedMeta::parse_meta_list(args) {
Ok(v) => v,
Err(e) => {
return TokenStream::from(Error::from(e).write_errors());
}
};
```
- In GenericParamExt, `LifetimeDef` is now `LifetimeParam`.
- In GenericParamExt, `as_lifetime_def` is renamed to `as_lifetime_param`.
- Flag and SpannedValue no longer implement `syn::spanned::Spanned`.
- The MSRV (minimum supported Rust version) is now 1.56, because of syn.
### Deprecation Warnings
In previous versions of `darling`, arbitrary expressions were passed in attributes by wrapping them in quotation marks.
v0.20.0 preserves this behavior for `syn::Expr`, but as a result a field expecting a `syn::Expr` cannot accept a string literal - it will incorrectly attempt to parse the contents. If this is an issue for you, please add a comment to [#229](https://github.com/TedDriggs/darling/issues/229).
## v0.14.4 (March 9, 2023)
- Add support for child diagnostics when `diagnostics` feature enabled [#224](https://github.com/TedDriggs/darling/issues/224)
## v0.14.3 (February 3, 2023)
- Re-export `syn` from `darling` to avoid requiring that consuming crates have a `syn` dependency.
- Change `<SpannedValue<T> as FromMeta>` impl to more precisely capture the _value_ span, as opposed to the span of the entire item.
- Add `darling::util::{AsShape, Shape, ShapeSet}` to improve "shape" validation for structs and variants. [#222](https://github.com/TedDriggs/issues/222)
## v0.14.2 (October 26, 2022)
- Derived impls of `FromMeta` will now error on literals, rather than silently ignoring them. [#193](https://github.com/TedDriggs/darling/pull/193)
- Don't include property paths in compile errors when spans are available. [#203](https://github.com/TedDriggs/darling/pull/203)
## v0.14.1 (April 28, 2022)
- Fix a bug where using a trait that accepts `#[darling(attributes(...))]` without specifying any attributes would emit code that did not compile. [#183](https://github.com/TedDriggs/darling/issues/183)
- Add `Error::span` and `Error::explicit_span` methods [#184](https://github.com/TedDriggs/darling/pull/184)
## v0.14.0 (April 13, 2022)
- **BREAKING CHANGE:** Remove many trait impls from `util::Flag`.
This type had a number of deref and operator impls that made it usable as sort-of-a-boolean.
Real-world usage showed this type is more useful if it's able to carry a span for good errors,
and that most of those impls were unnecessary. [#179](https://github.com/TedDriggs/darling/pull/179)
- Remove need for `#[darling(default)]` on `Option<T>` and `Flag` fields [#161](https://github.com/TedDriggs/darling/issues/161)
## v0.13.4 (April 6, 2022)
## v0.13.3 (April 5, 2022)
- Add `error::Accumulator` for dealing with multiple errors [#164](https://github.com/TedDriggs/darling/pull/164)
- Impl `FromMeta` for `syn::Type` and its variants [#172](https://github.com/TedDriggs/darling/pulls/172)
## v0.13.2 (March 30, 2022)
## v0.13.1 (December 7, 2021)
## v0.13.0 (May 20, 2021)
- Error on duplicate fields in `#[darling(...)]` attributes [#130](https://github.com/TedDriggs/darling/pull/130)
- Impl `Copy` for `SpannedValue<T: Copy>`
- Add `SpannedValue::map_ref`
## v0.13.0-beta (April 20, 2021)
- Error on duplicate fields in `#[darling(...)]` attributes [#130](https://github.com/TedDriggs/darling/pull/130)
## v0.12.4 (April 20, 2021)
- Add `and_then` to derive macros for `darling`
## v0.12.3 (April 8, 2021)
## v0.12.2 (February 23, 2021)
- Impl `FromMeta` for `HashMap<Ident, V>` and `HashMap<Path, V>`
## v0.12.1 (February 22, 2021)
- Remove use of `unreachable` from `darling::ast::Data` [#123](https://github.com/TedDriggs/darling/pull/123)
- Add `darling::ast::Data::try_empty_from` to avoid panics when trying to read a union body [#123](https://github.com/TedDriggs/darling/pull/123)
## v0.12.0 (January 5, 2021)
- POSSIBLY BREAKING: Derived impls of `FromDeriveInput`, `FromField`, `FromVariant`, and `FromTypeParam` will now error when encountering an attribute `darling` has been asked to parse that isn't a supported shape.
Any crates using `darling` that relied on those attributes being silently ignored could see new errors reported in their dependent crates. [#113](https://github.com/TedDriggs/darling/pull/113)
- Impl `syn::spanned::Spanned` for `darling::util::SpannedValue` [#113](https://github.com/TedDriggs/darling/pull/113)
- Add `darling::util::parse_attribute_to_meta_list` to provide useful errors during attribute parsing [#113](https://github.com/TedDriggs/darling/pull/113)
- Add `impl From<syn::Error> for Error` to losslessly propagate `syn` errors [#116](https://github.com/TedDriggs/darling/pull/116)
## v0.11.0 (December 14, 2020)
- Bump minor version due to unexpected breaking change [#107](https://github.com/TedDriggs/darling/issues/107)
## v0.10.3 (December 10, 2020)
- Add `discriminant` magic field when deriving `FromVariant` [#105](https://github.com/TedDriggs/darling/pull/105)
## v0.10.2 (October 30, 2019)
## v0.10.1 (September 25, 2019)
## v0.10.0 (August 15, 2019)
- Increase rust version to 1.31
## v0.9.0 (March 20, 2019)
- Enable "did you mean" suggestions by default
- Make `darling_core::{codegen, options}` private [#58](https://github.com/TedDriggs/darling/issues/58)
## v0.8.6 (March 18, 2019)
- Added "did you mean" suggestions for unknown fields behind the `suggestions` flag [#60](https://github.com/TedDriggs/issues/60)
- Added `Error::unknown_field_with_alts` to support the suggestion use-case.
- Added `ast::Fields::len` and `ast::Fields::is_empty` methods.
## v0.8.5 (February 4, 2019)
- Add `FromMeta` to the `syn::Lit` enum and its variants
- Improve error message for unexpected literal formats to not say "other"
## v0.8.4 (February 4, 2019)
- Use `syn::Error` to provide precise errors before `proc_macro::Diagnostic` is available
- Add `diagnostics` feature flag to toggle between stable and unstable error backends
- Attach error information in more contexts
- Add `allow_unknown_fields` to support parsing the same attribute multiple times for different macros [#51](https://github.com/darling/issues/51)
- Proc-macro authors will now see better errors in `darling` attributes
## v0.8.3 (January 21, 2019)
- Attach spans to errors for types with provided bespoke implementations
- Deprecate `set_span` from 0.8.2, as spans should never be broadened after being initially set
## v0.8.2 (January 17, 2019)
- Add spans to errors to make quality warnings and errors easy in darling. This is blocked on diagnostics stabilizing.
- Add `darling::util::SpannedValue` so proc-macro authors can remember position information alongside parsed values.
## v0.8.0
## v0.7.0 (July 24, 2018)
- Update dependencies on `syn` and `proc-macro2`
- Add `util::IdentString`, which acts as an Ident or its string equivalent
## v0.6.3 (May 22, 2018)
- Add support for `Uses*` traits in where predicates
## v0.6.2 (May 22, 2018)
- Add `usage` module for tracking type param and lifetime usage in generic declarations
- Don't add `FromMeta` bounds to type parameters only used by skipped fields [#40](https://github.com/darling/pull/40)
## v0.6.1 (May 17, 2018)
- Fix an issue where the `syn` update broke shape validation [#36](https://github.com/TedDriggs/darling/issues/36)
## v0.6.0 (May 15, 2018)
### Breaking Changes
- Renamed `FromMetaItem` to `FromMeta`, and renamed `from_meta_item` method to `from_meta`
- Added dedicated `derive(FromMetaItem)` which panics and redirects users to `FromMeta`
## v0.5.0 (May 10, 2018)
- Add `ast::Generics` and `ast::GenericParam` to work with generics in a manner similar to `ast::Data`
- Add `ast::GenericParamExt` to support alternate representations of generic parameters
- Add `util::WithOriginal` to get a parsed representation and syn's own struct for a syntax block
- Add `FromGenerics` and `FromGenericParam` traits (without derive support)
- Change generated code for `generics` magic field to invoke `FromGenerics` trait during parsing
## v0.4.0 (April 5, 2018)
- Update dependencies on `proc-macro`, `quote`, and `syn` [#26](https://github.com/TedDriggs/darling/pull/26). Thanks to @hcpl
## v0.3.3 (April 2, 2018)
**YANKED**
## v0.3.2 (March 13, 2018)
- Derive `Default` on `darling::Ignored` (fixes [#25](https://github.com/TedDriggs/darling/issues/25)).
## v0.3.1 (March 7, 2018)
## v0.3.0 (January 26, 2018)
### Breaking Changes
- Rename magic field `body` in derived `FromDeriveInput` structs to `data` to stay in sync with `syn`
- Rename magic field `data` in derived `FromVariant` structs to `fields` to stay in sync with `syn`
## v0.2.2 (December 5, 2017)
- Update `lazy_static` to 1.0 [#15](https://github.com/TedDriggs/darling/pull/16). Thanks to @Eijebong
## v0.2.1 (November 28, 2017)
## v0.2.0 (June 18, 2017)
- Added support for returning multiple errors from parsing [#5](https://github.com/TedDriggs/darling/pull/5)
- Removed default types for `V` and `F` from `ast::Body`
- Enum variants are automatically converted to snake_case [#12](https://github.com/TedDriggs/darling/pull/12)