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Rollup merge of #86533 - inquisitivecrystal:lower-case-error-explain,…
… r=petrochenkov Support lowercase error codes in `--explain` This enables `rustc --explain` to accept a lowercase error code. Thus, for instance, `rustc --explain e0573` would be valid after this change, where before a user would have needed to do `rustc --explain E0573`. Although the upper case form of an error code is canonical, the user may prefer the easier-to-type lowercase form, and there's nothing to be gained by forcing them to type the upper case version. Resolves #86518.
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