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# Preventing the Derivation of `Debug`
`bindgen` will attempt to derive the `Debug` traits on a best-effort
basis. Sometimes, it might not understand that although adding `#[derive(Debug)]` to a translated type definition will compile, it still shouldn't do
that for reasons it can't know. In these cases, the `nodebug` annotation can be
used to prevent bindgen to autoderive the `Debug` traits for a type.
### Library
* [`bindgen::Builder::no_debug`](https://docs.rs/bindgen/latest/bindgen/struct.Builder.html#method.no_debug)
### Command Line
* `--no-debug <regex>`
### Annotations
```c
/**
* Although bindgen can't know, this enum is not safe to format the output.
* the value may be combined with multiple bits in many C/C++ cases,
* for example:
*
* <div rustbindgen nodebug></div>
*/
enum AVRounding {
AV_ROUND_ZERO = 0,
AV_ROUND_INF = 1,
AV_ROUND_DOWN = 2,
AV_ROUND_UP = 3,
AV_ROUND_NEAR_INF = 5,
AV_ROUND_PASS_MINMAX = 8192,
};
// Prototype
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const;
// Call
int64_t pts = av_rescale_rnd(40000, 3600, 90000, AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX);
```
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