Update darling requirement from 0.10 to 0.12 in /language-server-macros

[dependabot-preview]

Updates the requirements on darling to permit the latest version.

Changelog

Sourced from darling's changelog.

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
• Impl syn::spanned::Spanned for darling::util::SpannedValue #113
• Add darling::util::parse_attribute_to_meta_list to provide useful errors during attribute parsing #113
• Add impl From<syn::Error> for Error to losslessly propagate syn errors #116

v0.11.0 (December 14, 2020)

• Bump minor version due to unexpected breaking change #107

v0.10.3 (December 10, 2020)

• Add discriminant magic field when deriving FromVariant #105

v0.10.2 (October 30, 2019)

• Bump syn dependency to 1.0.1 #83

v0.10.1 (September 25, 2019)

• Fix test compilation errors #81

v0.10.0 (August 15, 2019)

• Bump syn and quote to 1.0 #79
• 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
• Fix Override::as_mut: #66

v0.8.6 (March 18, 2019)

• Added "did you mean" suggestions for unknown fields behind the suggestions flag #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)

• Accept unquoted positive numeric literals #52
• 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
• Proc-macro authors will now see better errors in darling attributes

v0.8.3 (January 21, 2019)

• Attach spans to errors in generated trait impls #37
• 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

Commits

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[dependabot-preview]

Superseded by #44.