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-derive(Error)
-=============
-
-[<img alt="github" src="https://img.shields.io/badge/github-dtolnay/thiserror-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/thiserror)
-[<img alt="crates.io" src="https://img.shields.io/crates/v/thiserror.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/thiserror)
-[<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-thiserror-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20">](https://docs.rs/thiserror)
-[<img alt="build status" src="https://img.shields.io/github/actions/workflow/status/dtolnay/thiserror/ci.yml?branch=master&style=for-the-badge" height="20">](https://github.com/dtolnay/thiserror/actions?query=branch%3Amaster)
-
-This library provides a convenient derive macro for the standard library's
-[`std::error::Error`] trait.
-
-[`std::error::Error`]: https://doc.rust-lang.org/std/error/trait.Error.html
-
-```toml
-[dependencies]
-thiserror = "1.0"
-```
-
-*Compiler support: requires rustc 1.56+*
-
-<br>
-
-## Example
-
-```rust
-use thiserror::Error;
-
-#[derive(Error, Debug)]
-pub enum DataStoreError {
-    #[error("data store disconnected")]
-    Disconnect(#[from] io::Error),
-    #[error("the data for key `{0}` is not available")]
-    Redaction(String),
-    #[error("invalid header (expected {expected:?}, found {found:?})")]
-    InvalidHeader {
-        expected: String,
-        found: String,
-    },
-    #[error("unknown data store error")]
-    Unknown,
-}
-```
-
-<br>
-
-## Details
-
-- Thiserror deliberately does not appear in your public API. You get the same
-  thing as if you had written an implementation of `std::error::Error` by hand,
-  and switching from handwritten impls to thiserror or vice versa is not a
-  breaking change.
-
-- Errors may be enums, structs with named fields, tuple structs, or unit
-  structs.
-
-- A `Display` impl is generated for your error if you provide `#[error("...")]`
-  messages on the struct or each variant of your enum, as shown above in the
-  example.
-
-  The messages support a shorthand for interpolating fields from the error.
-
-    - `#[error("{var}")]`&ensp;⟶&ensp;`write!("{}", self.var)`
-    - `#[error("{0}")]`&ensp;⟶&ensp;`write!("{}", self.0)`
-    - `#[error("{var:?}")]`&ensp;⟶&ensp;`write!("{:?}", self.var)`
-    - `#[error("{0:?}")]`&ensp;⟶&ensp;`write!("{:?}", self.0)`
-
-  These shorthands can be used together with any additional format args, which
-  may be arbitrary expressions. For example:
-
-  ```rust
-  #[derive(Error, Debug)]
-  pub enum Error {
-      #[error("invalid rdo_lookahead_frames {0} (expected < {})", i32::MAX)]
-      InvalidLookahead(u32),
-  }
-  ```
-
-  If one of the additional expression arguments needs to refer to a field of the
-  struct or enum, then refer to named fields as `.var` and tuple fields as `.0`.
-
-  ```rust
-  #[derive(Error, Debug)]
-  pub enum Error {
-      #[error("first letter must be lowercase but was {:?}", first_char(.0))]
-      WrongCase(String),
-      #[error("invalid index {idx}, expected at least {} and at most {}", .limits.lo, .limits.hi)]
-      OutOfBounds { idx: usize, limits: Limits },
-  }
-  ```
-
-- A `From` impl is generated for each variant containing a `#[from]` attribute.
-
-  Note that the variant must not contain any other fields beyond the source
-  error and possibly a backtrace. A backtrace is captured from within the `From`
-  impl if there is a field for it.
-
-  ```rust
-  #[derive(Error, Debug)]
-  pub enum MyError {
-      Io {
-          #[from]
-          source: io::Error,
-          backtrace: Backtrace,
-      },
-  }
-  ```
-
-- The Error trait's `source()` method is implemented to return whichever field
-  has a `#[source]` attribute or is named `source`, if any. This is for
-  identifying the underlying lower level error that caused your error.
-
-  The `#[from]` attribute always implies that the same field is `#[source]`, so
-  you don't ever need to specify both attributes.
-
-  Any error type that implements `std::error::Error` or dereferences to `dyn
-  std::error::Error` will work as a source.
-
-  ```rust
-  #[derive(Error, Debug)]
-  pub struct MyError {
-      msg: String,
-      #[source]  // optional if field name is `source`
-      source: anyhow::Error,
-  }
-  ```
-
-- The Error trait's `provide()` method is implemented to provide whichever field
-  has a type named `Backtrace`, if any, as a `std::backtrace::Backtrace`.
-
-  ```rust
-  use std::backtrace::Backtrace;
-
-  #[derive(Error, Debug)]
-  pub struct MyError {
-      msg: String,
-      backtrace: Backtrace,  // automatically detected
-  }
-  ```
-
-- If a field is both a source (named `source`, or has `#[source]` or `#[from]`
-  attribute) *and* is marked `#[backtrace]`, then the Error trait's `provide()`
-  method is forwarded to the source's `provide` so that both layers of the error
-  share the same backtrace.
-
-  ```rust
-  #[derive(Error, Debug)]
-  pub enum MyError {
-      Io {
-          #[backtrace]
-          source: io::Error,
-      },
-  }
-  ```
-
-- Errors may use `error(transparent)` to forward the source and Display methods
-  straight through to an underlying error without adding an additional message.
-  This would be appropriate for enums that need an "anything else" variant.
-
-  ```rust
-  #[derive(Error, Debug)]
-  pub enum MyError {
-      ...
-
-      #[error(transparent)]
-      Other(#[from] anyhow::Error),  // source and Display delegate to anyhow::Error
-  }
-  ```
-
-  Another use case is hiding implementation details of an error representation
-  behind an opaque error type, so that the representation is able to evolve
-  without breaking the crate's public API.
-
-  ```rust
-  // PublicError is public, but opaque and easy to keep compatible.
-  #[derive(Error, Debug)]
-  #[error(transparent)]
-  pub struct PublicError(#[from] ErrorRepr);
-
-  impl PublicError {
-      // Accessors for anything we do want to expose publicly.
-  }
-
-  // Private and free to change across minor version of the crate.
-  #[derive(Error, Debug)]
-  enum ErrorRepr {
-      ...
-  }
-  ```
-
-- See also the [`anyhow`] library for a convenient single error type to use in
-  application code.
-
-  [`anyhow`]: https://github.com/dtolnay/anyhow
-
-<br>
-
-## Comparison to anyhow
-
-Use thiserror if you care about designing your own dedicated error type(s) so
-that the caller receives exactly the information that you choose in the event of
-failure. This most often applies to library-like code. Use [Anyhow] if you don't
-care what error type your functions return, you just want it to be easy. This is
-common in application-like code.
-
-[Anyhow]: https://github.com/dtolnay/anyhow
-
-<br>
-
-#### License
-
-<sup>
-Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
-2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
-</sup>
-
-<br>
-
-<sub>
-Unless you explicitly state otherwise, any contribution intentionally submitted
-for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
-be dual licensed as above, without any additional terms or conditions.
-</sub>