Error E334: "await" requires the .NET 4.5 Framework, or higher

Elements Oxygene
1

Hi
Getting odd compiler error when building following tried with 4.5 and 4.6, same error
oh, and this is on current release and latest beta

namespace AsyncDeligateTest;

interface

uses
  System.Linq, 
  System.Threading.Tasks;

type
  Program = class
  private
    class method Caller(handler: Func<Integer,Func<Task>,Task>);
  public
    class method Main(args: array of String): Int32;
  end;

implementation

class method Program.Main(args: array of String): Int32;
begin
  Caller((i,t) -> begin
    Console.WriteLine(i);
    await t;
  end);
end;

class method Program.Caller(handler: Func<Integer,Func<Task>,Task>);
begin
  handler(10, -> await Task.Delay(1000));
end;

end.
2

Hello Alex,

  1. please use the “Preformatted text” tool in the tool bar to format your example correctly
  2. In the Project properties, did you select .NET 4.5?
    Patrick
3

Thanks, logged as bugs://74410

4

This variant of above also gives an E0 Internal error: Object reference not set to an instance of an object

namespace AsyncDeligateTest;

interface

uses
  System.Linq, 
  System.Threading.Tasks;

type
  ITest = public interface
    method WriteAsync(s: String): Task;
  end;

  Program = class
  private
    class method Caller(handler: Func<ITest,Func<Task>,Task>);
  public
    class method Main(args: array of String): Int32;
  end;

implementation

class method Program.Main(args: array of String): Int32;
begin
  Caller((ctx,next) -> begin
    await ctx.WriteAsync('Testing');
    await next;
  end);
end;

class method Program.Caller(handler: Func<ITest,Func<Task>,Task>);
begin
  handler(nil, -> await Task.Delay(1000));
end;

end.
5

So the error is completely wrong, but it fails because in await t “t” is a func (delegate). If you turn it into await t() it will work.I’m fixing the error message and the NRE now.

6

bugs://74410 got closed with status fixed.