Commits on May 14, 2024

1. Migrate out from proc macro error …

   Implement `Result<T, E>` based proc macro error handling instead of out
   of fashion `proc_macro_error` that still is in _syn_ `1.0`. This allows
   us to remove the need for `proc_macro_error` crate and makes our
   dependency tree leaner.
   
   The error handling is implemented with custom `ToTokensDiagnostics` trait
   that is used instead of the `ToTokens` when there is a possibility for
   error. Error is passed up in the call stack via `Diagnostics` struct
   that converts to compile error token stream at root of the macro call.
   
   The result based approach is the recommended way of handling compile
   errors in proc macros.
   
   Resolves #854

   

   juhaku committed May 14, 2024
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