feat!(render): render_report can accept more types #371
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Brings things in line with best practices as described in "Rust for Rustaceans" when it comes to "Ergonomic Trait Implementations" in Chapter 3. Practically means that people can pass more types to any functions taking either `dyn Diagnostic` or `impl Diagnostic`. BREAKING CHANGE: Added blanket impls may overlap with manual user impls. If these impls are just hacks to achieve the same as the blanket ones do, then they can simply be removed. If the impls for `T` and `&T` differ semantically, then the user would need to employ the newtype pattern to avoid overlap.
You can now pass a `&dyn Diagnostic` (as before), or a `Report` (or `&Report`, `&mut Report`, or `Box<Report>`), or anything else that implements `Diagnostic` to `render_report`. More generally, users can use the `AsDiagnostic` trait wherever they want to write functions that accept either a `Report` or `Diagnostic` — this improves ergonomics in a world where `impl Diagnostic for Report` is impossible. BREAKING CHANGE: Because more types can now be passed to `render_report`, `Report::as_ref()` can get confused about types and inference fails. The solution is removing the `.as_ref()` altogether since `Report` is now a directly accepted type.
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This PR builds on PR #367! Merging this should be equivalent to merging both!
You can now pass a
&dyn Diagnostic(as before), or aReport(or&Report,&mut Report, orBox<Report>), or anything else that implementsDiagnostictorender_report.More generally, users can use the
AsDiagnostictrait wherever they want to write functions that accept either aReportorDiagnostic— this improves ergonomics in a world whereimpl Diagnostic for Reportis impossible.BREAKING CHANGE: Because more types can now be passed to
render_report,Report::as_ref()can get confused about types, and inference fails. The solution is removing the.as_ref()altogether sinceReportis now a directly accepted type.This would also effectively close #366 (for my purposes, at least), since anything accepting
AsDiagnosticwill work forReportand anything that implementsDiagnostic!BEFORE MERGING: After getting the green light from you, but before merging this, I'll have to properly fill in the documentation for
AsDiagnostic! I don't thinkWOOFandBARKis particularly helpful, but I didn't want to write docs before knowing if you'd be interested in accepting this PR!