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The standard requires overloads of std::to_chars for char and (un)signed integer types. This means that our constrained function template is non-conforming, because the difference is observable when using types that convert to an integer (e.g. wchar_t, which promotes). As well as defining the deleted bool overload for LWG 3266, replace the constrained function template with overloads for each type. * include/std/charconv (to_chars): Rename to __to_chars_i. Define non-template overloads for each signed and unsigned integer type and char. Define deleted overload for bool (LWG 3266). * testsuite/20_util/to_chars/1_neg.cc: Remove. * testsuite/20_util/to_chars/3.cc: New test. * testsuite/20_util/to_chars/lwg3266.cc: New test. From-SVN: r275588
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