einstellung_derive 0.1.0

Proc-Macro crate for einstellung
Documentation 
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error[E0107]: type alias takes 2 generic arguments but 1 generic argument was supplied
 --> src/trybuild_tests/custom_merge_wrong_signature.rs
  |
  | #[derive(Config)]
  |          ------ supplied 1 generic argument
  | struct ServerConfig {
  |     #[config(merge(function = "merge_hosts"))]
  |                               ^^^^^^^^^^^^^ expected 2 generic arguments
  |
note: type alias defined here, with 2 generic parameters: `T`, `E`
 --> $WORKSPACE/einstellung/src/lib.rs
  |
  | pub type MergeFunction<T, E> = fn(T, T) -> Result<T, E>;
  |          ^^^^^^^^^^^^^ -  -

error[E0308]: arguments to this function are incorrect
 --> src/trybuild_tests/custom_merge_wrong_signature.rs
  |
  | #[derive(Config)]
  |          ^^^^^^
  |          |
  |          expected `String`, found `Option<String>`
  |          expected `String`, found `Option<String>`
  |
  = note: expected struct `std::string::String`
               found enum `std::option::Option<std::string::String>`
  = note: expected struct `std::string::String`
               found enum `std::option::Option<std::string::String>`
note: function defined here
 --> src/trybuild_tests/custom_merge_wrong_signature.rs
  |
  | pub fn merge_hosts(_: String, b: String) -> Result<String, einstellung::ConfigError> {
  |        ^^^^^^^^^^^ ---------  ---------
  = note: this error originates in the derive macro `Config` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider using `Option::expect` to unwrap the `std::option::Option<std::string::String>` value, panicking if the value is an `Option::None`
  |
7 | #[derive(Config.expect("REASON"))]
  |                +++++++++++++++++
help: consider using `Option::expect` to unwrap the `std::option::Option<std::string::String>` value, panicking if the value is an `Option::None`
  |
7 | #[derive(Config.expect("REASON"))]
  |                +++++++++++++++++

error[E0308]: mismatched types
 --> src/trybuild_tests/custom_merge_wrong_signature.rs
  |
  |     #[config(merge(function = "merge_hosts"))]
  |                               ^^^^^^^^^^^^^ expected `Box<dyn Error>`, found `ConfigError`
  |
  = note: expected struct `Box<(dyn StdError + 'static)>`
               found enum `ConfigError`
  = note: for more on the distinction between the stack and the heap, read https://doc.rust-lang.org/book/ch15-01-box.html, https://doc.rust-lang.org/rust-by-example/std/box.html, and https://doc.rust-lang.org/std/boxed/index.html
help: store this in the heap by calling `Box::new`
  |
9 |     #[config(merge(function = reason: Box::new("merge_hosts")))]
  |                               +++++++++++++++++             +

error[E0308]: mismatched types
 --> src/trybuild_tests/custom_merge_wrong_signature.rs
  |
  | #[derive(Config)]
  |          ^^^^^^ expected `Option<String>`, found `Result<String, ConfigError>`
  |
  = note: expected enum `std::option::Option<std::string::String>`
             found enum `Result<std::string::String, ConfigError>`
  = note: this error originates in the derive macro `Config` (in Nightly builds, run with -Z macro-backtrace for more info)