13 curated breaking changes across major versions of miette-derive. Use this as a migration checklist before bumping dependencies.
**source-code:** Don't override provided source code (#300) ([0d5c2ce7](https://github.com/zkat/miette/commit/0d5c2ce7536b0ea205346595d8a00d00bfb6cbd2))
**BREAKING CHANGE**: Source code is no longer overridden if it was provided by the diagnostic's own `source_code()` impl.
**source:** use `usize` for length (#265) ([fad0e76a](https://github.com/zkat/miette/commit/fad0e76ad2e19d5cac13cf8324338aca0d623d93))
**BREAKING CHANGE**: This changes `SourceSpan`'s length type to `usize`.
**source:** Allow inner source type of a NamedSource to be borrowed (#254) ([1df3b1a5](https://github.com/zkat/miette/commit/1df3b1a537f2e54cd40ec45f5cd851337a22e95a))
**theme:** restructure automatic color selection (#177) ([1816b06a](https://github.com/zkat/miette/commit/1816b06a2efcd5705dfe91147ab5651fe0b517d6))
The default theme now prefers ANSI colors, even if RGB is supported
`MietteHandlerOpts::ansi_colors` is removed
`MietteHandlerOpts::rgb_color` now takes an enum that controls the color format used when color support is enabled, and has no effect otherwise.
**colors:** treat no-color mode as no-color instead of narratable (#94) ([9dcce5f1](https://github.com/zkat/miette/commit/9dcce5f1bdd76e7564d604ab8b87bbc7caad310a))
**BREAKING CHANGE**: NO_COLOR no longer triggers the narrated handler. Use NO_GRAPHICS instead.
**derive:** Make derive macro `diagnostic` attribute more flexible. (#115) ([5b8b5478](https://github.com/zkat/miette/commit/5b8b5478b63e91a51fadec87c6fed3e60d192b60))
**BREAKING CHANGE**: `diagnostic` attribute duplication will now error.
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