fix(deps): update rust crate darling to 0.20.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
darling	dependencies	minor	0.14.1 -> 0.20.0

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Release Notes

TedDriggs/darling (darling)

v0.20.10

• Add #[allow(clippy::manual_unwrap_or_default)] to all generated impls to avoid causing clippy fails in crates using darling #​296
• Properly initialize attrs magic field in derived FromAttributes impls #​297

v0.20.9

• Allow word-form for newtype enum variants whose only field produces a value when from_none is called on their type #​249
• Add FromMeta impls for the std::num::NonZero* types #​288
• Fix panic in number FromMeta impls when the parsed value is too large for the receiver type #​289

v0.20.8

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

v0.20.7

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• 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

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• 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

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

v0.20.4

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• 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

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• Add FromMeta impl for u128 and i128 #​243

v0.20.1

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• Add #[allow(clippy::manual_unwrap_or_default)] to all generated impls to avoid causing clippy fails in crates using darling #​296
• Properly initialize attrs magic field in derived FromAttributes impls #​297

v0.20.0

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• 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

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

v0.14.3

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• 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

v0.14.2

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• Derived impls of FromMeta will now error on literals, rather than silently ignoring them. #​193
• Don't include property paths in compile errors when spans are available. #​203

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