CliCommandLineParser
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System.IndexOutOfRangeException from Microsoft.DotNet.Cli.CommandLine.StringExtensions.HasPrefix
>dotnet.exe msbuild ""
System.IndexOutOfRangeException: Index was outside the bounds of the array.
at System.String.get_Chars(Int32 index)
at Microsoft.DotNet.Cli.CommandLine.StringExtensions.HasPrefix(String arg)
at Microsoft.DotNet.Cli.CommandLine.StringExtensions.<Lex>d__7.MoveNext()
at System.Collections.Generic.EnumerableHelpers.ToArray[T](IEnumerable`1 source, Int32& length)
at System.Collections.Generic.Queue`1..ctor(IEnumerable`1 collection)
at Microsoft.DotNet.Cli.CommandLine.Parser.Parse(IReadOnlyCollection`1 rawArgs, Boolean isProgressive)
at Microsoft.DotNet.Cli.CommandLine.Parser.Parse(String[] args)
at Microsoft.DotNet.Cli.ParserExtensions.ParseFrom(Parser parser, String context, String[] args)
at Microsoft.DotNet.Cli.Program.ProcessArgs(String[] args, ITelemetry telemetryClient)
at Microsoft.DotNet.Cli.Program.Main(String[] args)
The check on https://github.com/dotnet/CliCommandLineParser/blob/ed4799b3d86e4eb3bef7c33956a4ef65c91fecbc/src/source/CommandLine/OptionError.cs#L19 should simply be for null, not for null or whitespace.