01903944d8
Allow `-Z treat-err-as-bug=0`
Makes `-Z treat-err-as-bug=0` behave as if the option wasn't present instead of asking the value to be ⩾ 1. This enables a quick on/off of the option, as you only need to change one character instead of removing the whole `-Z`.
Also update some text, e.g.
```bash
$ rustc -Z help | grep treat-err-as-bug
-Z treat-err-as-bug=val -- treat error number `val` that occurs as bug
```
where the value could be interpreted as an error code instead of an ordinal.
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| .. | ||
| json | ||
| markdown | ||
| annotate_snippet_emitter_writer.rs | ||
| diagnostic.rs | ||
| diagnostic_builder.rs | ||
| diagnostic_impls.rs | ||
| emitter.rs | ||
| error.rs | ||
| json.rs | ||
| lib.rs | ||
| lock.rs | ||
| registry.rs | ||
| snippet.rs | ||
| styled_buffer.rs | ||
| tests.rs | ||
| translation.rs | ||