CODEWITHSUNDEEP
rustthiserror
Roman Mahotskyi
Roman Mahotskyi

Reputation: 6685

Reuse error message from `thiserror` definition

I use thiserror crate for error handling inside my project.

I declare an error like this

#[derive(Debug, thiserror::Error)]
enum CustomErrors {
    #[error("This is custom error one")]
    CustomErrorOne,

    #[error("This is custom error two")]
    CustomErrorTwo
}

I use this custom error like this

// cut

match foo() {
  Err(errors) -> match errors {
     CustomErrors::CustomErrorOne => ..., // I want to get access to "This is custom error one" error message here
     CustomErrors::CustomErrorTwo => ..., // ...and here
  }
}

//cut

Am I understanding correctly that this is not possible due to the philosophy of the thiserror? And it requires creating a new error message?

Thiserror deliberately does not appear in your public API. (c) Documentation

Upvotes: 4

Views: 2101

Answers (1)

kmdreko
kmdreko

Reputation: 60822

From the docs:

A Display impl is generated for your error if you provide #[error("...")] messages on the struct or each variant of your enum...

So if you want to get that string from the CustomErrors, you just need to call .to_string().

Upvotes: 8

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