derive: fix handling of generic bounds #178
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japaric
approved these changes
Sep 22, 2020
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This fixes bounds on generic parameters getting duplicated into the wrong place of the generated impl, which closes #176.
This also makes the custom derive emit bounds on type parameters instead of field types, since the latter can apparently run into very obscure and impossible to debug compiler bugs like rust-lang/rust#77052. This matches the behavior of Rust's built-in derives.