private static bool IsAssignableExpression(Binder binder, BoundExpression expression)
{
// NOTE: Surprisingly, binder.CheckValueKind will return true (!) for readonly fields
// in contexts where they cannot be assigned - it simply reports a diagnostic.
// Presumably, this is done to avoid producing a confusing error message about the
// field not being an lvalue.
var diagnostics = DiagnosticBag.GetInstance();
var result = binder.CheckValueKind(expression, Binder.BindValueKind.Assignment, diagnostics) &&
!diagnostics.HasAnyErrors();
diagnostics.Free();
return result;
}
