v0.20.8

• Add #[darling(with = ...)] support to attrs magic field to allow using custom receiver types for attrs #273

v0.20.7

• Add #[darling(flatten)] to allow forwarding unknown fields to another struct #146
• Don't suggest names of skipped fields in derived impls #268

v0.20.6

• Fix some missing syn invisible group handling in FromMeta impls #263
• Fix misleading error message on Error::unexpected_type so it no longer implies the type was a literal #264
• Impl FromMeta Vec of literals, e.g. LitStr #265

v0.20.5

• Add Flag::span inherent method, as Flag can no longer impl syn::spanned::Spanned #242

v0.20.4

• Accept bare paths in #[darling(default = ...)] #258
• Add FromMeta impl for PathBuf #259
• Improve FromMeta implementation for enums #260
  • Properly implement unit arms in FromMeta::from_list to provide a consistent API for heterogeneous enums that include a mix of unit, newtype and struct variants
  • Add #[darling(word)] attribute for unit enum variants (See #63 for details)

v0.20.3

• Add FromMeta impl for u128 and i128 #243

This release also includes features originally slated for 0.20.2, as that was never published.

• Allow darling users to omit quotation marks for paths and idents #236
• Add new util functions for controlling how quotation marks are handled when reading into Expr fields #235

v0.20.1

• Add Clone impl for NestedMeta #230

v0.20.0

v0.20.0 (April 27, 2023)

• Bump syn to version 2, courtesy of @jonasbb #227

Breaking Changes

• Replace all occurrences of syn::NestedMeta with darling::ast::NestedMeta.

• Replacement for the deprecated AttributeArgs:

// 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.

v0.14.4

• Add support for child diagnostics when diagnostics feature enabled #224

v0.14.3

• 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