f4bb956278
Make Handler more thread-safe
The use of `code_emitted` to suppress extended explanations is not thread safe. I'm not sure why we keep the documentation for errors outside `diagnostics.rs` anyway. It would be better to add a `teach` method to `DiagnosticsBuilder`, so instead of:
```
if self.tcx.sess.teach(&err.get_code().unwrap()) {
err.note("...");
}
```
we'd use `err.teach("...")`
cc @estebank
r? @michaelwoerister
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| .. | ||
| clean | ||
| html | ||
| passes | ||
| Cargo.toml | ||
| README.md | ||
| core.rs | ||
| doctree.rs | ||
| externalfiles.rs | ||
| fold.rs | ||
| lib.rs | ||
| markdown.rs | ||
| plugins.rs | ||
| test.rs | ||
| theme.rs | ||
| visit_ast.rs | ||
| visit_lib.rs | ||
README.md
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