private bool IsImmutableOrValidMutableType(ITypeSymbol typeSymbol, ExpressionSyntax value = null)
{
if (value.IsNullLiteral())
{
return(true);
}
if (typeSymbol is INamedTypeSymbol namedTypeSymbol)
{
typeSymbol = namedTypeSymbol.ConstructedFrom;
}
return(!typeSymbol.DerivesOrImplementsAny(MutableBaseTypes) ||
typeSymbol.DerivesOrImplementsAny(ImmutableBaseTypes));
}
private static bool IsOrDerivesOrImplementsAny(ITypeSymbol typeSymbol, ISet <KnownType> knownTypes)
{
return(typeSymbol.IsAny(knownTypes) ||
typeSymbol.DerivesOrImplementsAny(knownTypes));
}