thiserror 1.0.17

derive(Error)
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error[E0599]: no method named `as_dyn_error` found for struct `std::string::String` in the current scope
   --> $DIR/source-struct-not-error.rs:6:5
    |
6   |       source: String,
    |       ^^^^^^ method not found in `std::string::String`
    |
    = note: the method `as_dyn_error` exists but the following trait bounds were not satisfied:
            `std::string::String: std::error::Error`
            which is required by `std::string::String: thiserror::aserror::AsDynError`
            `str: std::marker::Sized`
            which is required by `str: thiserror::aserror::AsDynError`
            `str: std::error::Error`
            which is required by `str: thiserror::aserror::AsDynError`