Diesel's derives have been fully rewritten to take advantage of the new error reporting features available on nightly Rust. If you enable the `unstable` feature with Diesel's master branch, you get much nicer errors!pic.twitter.com/zOGKVEQdA6
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Actually there's zero introspection going on here. The error is caused by the generated code, not by Diesel explicitly doing anything. We just maintain proper source information in the generated tokens
Macros in Rust can't do introspection if they wanted to. The only information you have are the tokens you're given.
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