public static MemberDeclarationSyntax TimeSpanTryParseSpanSyntax(this PrimitiveDescriptor descriptor) => descriptor.DateTimeTryParseSyntax("TimeSpanStyles", ReadOnlySpanChar);
public static MemberDeclarationSyntax TimeSpanTryParseStringSyntax(this PrimitiveDescriptor descriptor) => descriptor.DateTimeTryParseSyntax("TimeSpanStyles", PredefinedType(Token(SyntaxKind.StringKeyword)));