Convert to generated regex fixer is disabled on regex parse errors hit during counting captures #80004
Description
private static Regex regex = new Regex(@"abc\g");
Run the fixer, it gets disabled with a banner, clicking on 'show stack' gives the below
System.Text.RegularExpressions.RegexParseException : Invalid pattern '\g' at offset 2. Unrecognized escape sequence \\g.
at System.Text.RegularExpressions.RegexParser.ScanCharEscape()
at System.Text.RegularExpressions.RegexParser.ScanBasicBackslash(Boolean scanOnly)
at System.Text.RegularExpressions.RegexParser.ScanBackslash(Boolean scanOnly)
at System.Text.RegularExpressions.RegexParser.CountCaptures(RegexOptions& optionsFoundInPattern)
at System.Text.RegularExpressions.RegexParser.ParseOptionsInPattern(String pattern,RegexOptions options)
at async System.Text.RegularExpressions.Generator.UpgradeToGeneratedRegexCodeFixer.ConvertToSourceGenerator(<Unknown Parameters>)
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
Parse errors that the capture-counting path skips do not hit this, eg.,
private static Regex regex = new Regex(@".{23423423434324243}");This will offer the fixer and run it. (Possibly it should not offer the fixer, but at least it doesn't crash.)