/// <summary>
/// Guess the non-error type that the given type was intended to represent.
/// If the type itself is not an error type, then it will be returned.
/// Otherwise, the underlying type (if any) of the error type will be
/// returned.
/// </summary>
/// <remarks>
/// Any non-null type symbol returned is guaranteed not to be an error type.
///
/// It is possible to pass in a constructed type and received back an
/// unconstructed type. This can occur when the type passed in was
/// constructed from an error type - the underlying definition will be
/// available, but there won't be a good way to "re-substitute" back up
/// to the level of the specified type.
/// </remarks>
internal static TypeSymbol GetNonErrorGuess(this TypeSymbol type)
{
var result = ExtendedErrorTypeSymbol.ExtractNonErrorType(type);
Debug.Assert((object)result == null || !result.IsErrorType());
return(result);
}
