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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Regression in v0.12.0: External error types no longer work with lambda_runtime::run","articleBody":"With the release of v0.12.0, it is no longer possible to use error types defined externally to your own crate. This is caused by the inclusion of #897.\r\n\r\nExample:\r\n\r\n```rust\r\n// Works in both v0.11.3 and v0.12.0\r\ntype Error = Box\u003cdyn std::error::Error\u003e;\r\n\r\n// Works in v0.11.3 but not in v0.12.0\r\n// type Error = std::io::Error;\r\n\r\n// Works in v0.11.3 but not in v0.12.0\r\n// type Error = anyhow::Error;\r\n\r\n// Works in neither v0.11.3 nor v0.12.0\r\n// type Error = lambda_runtime::Diagnostic\u003c'static\u003e;\r\n\r\nasync fn handler(_event: lambda_runtime::LambdaEvent\u003c()\u003e) -\u003e Result\u003c(), Error\u003e {\r\n    Ok(())\r\n}\r\n\r\n#[tokio::main]\r\nasync fn main() {\r\n    lambda_runtime::run(lambda_runtime::service_fn(handler))\r\n        .await\r\n        .unwrap();\r\n}\r\n```\r\n\r\nNote that it is not possible to implement `Into\u003cDiagnostic\u003c'a\u003e\u003e` yourself for any of these types because of the orphan rules.","author":{"url":"https://github.com/TethysSvensson","@type":"Person","name":"TethysSvensson"},"datePublished":"2024-06-26T15:13:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/901/aws-lambda-rust-runtime/issues/901"}