new chapter with examples of diagnostic translation PRs #1621
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| ecx.struct_span_err(span, "proc-macro derive produced unparseable tokens").emit(); | ||
| ``` | ||
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| > Note that `ecx.struct_span_err` is the [Session::struct_span_err]. |
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| > Note that `ecx.struct_span_err` is the [Session::struct_span_err]. | |
| > Note that `ecx.struct_span_err` calls [Session::struct_span_err]. |
This should also probably link to ecx.struct_span_err (https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/base/struct.ExtCtxt.html#method.struct_span_err) so that users can attest this relationship themselves.
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yeah, that should have been ultimately calls...
| - Replace the code above with this: | ||
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| ```rust | ||
| ecx.sess.emit_err(errors::ProcMacroDeriveTokens { span }); |
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Should point to emit_err in rustdocs. Also, useful to point out that if the user wants to make a diagnostic, but not emit it, they can use create_err.
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tough balance between adding useful info and avoiding the overwhelm... I should find a way to fit create_err in the reference
| ecx.sess.emit_err(errors::ProcMacroDeriveTokens { span }); | ||
| ``` | ||
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| - Create the above type, `errors::ProcMacroDeriveTokens`, |
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| - Create the above type, `errors::ProcMacroDeriveTokens`, | |
| - Add a diagnostic struct, `errors::ProcMacroDeriveTokens`, |
| Referring to the [general comments](#general-comments) section above, | ||
| follow these changes: | ||
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| - Replace the code above with this: |
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| - Replace the code above with this: | |
| - Replace the calls to `struct_span_err` and `emit` with: |
| #[derive(Diagnostic)] | ||
| #[diag(expand_proc_macro_derive_tokens)] | ||
| pub struct ProcMacroDeriveTokens { | ||
| #[primary_span] |
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I think it may be useful to motivate the three important parts of this:
derive(Diagnostic)diag(FLUENT_SLUG)- and
primary_span
Maybe why we need these three components, what other components are common, etc?
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I more wanted to have people see the pattern, than do wall-of-text which can overwhelm. The more complete details are in the reference chapters (earlier in the guide).
Co-authored-by: Michael Goulet <[email protected]>
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@compiler-errors do you think this is fine to merge now?. |
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Update: cf rust-lang/rust#132181 (diag infra currently in limbo, no longer mandatory usage, but examples/clarifications will still be very helpful) |
jieyouxu
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I found other examples overwhelming, as they tend to handle large parts of rustc crates, so decided to point to these more simple ones I created.