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Auto merge of rust-lang#46907 - varkor:contrib-8, r=nagisa
Allow non-alphabetic underscores in camel case Certain identifiers, such as `X86_64`, cannot currently be unambiguously represented in camel case (`X8664`, `X86_64`, `X8_664`, etc. are all transformed to the same identifier). This change relaxes the rules so that underscores are permitted between two non-alphabetic characters under `#[forbid(non_camel_case_types)]`. Fixes rust-lang#34633 and fixes rust-lang#41621.
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