Compiling DWScript units with circular references gives ECompileError "Unknown Name"

I have two DWScript unit files:

unit unit1;                    | unit unit2;
                               | 
interface                      | interface
                               | 
procedure Proc1exec;           | procedure Proc2exec;
procedure Proc1;               | procedure Proc2;
                               | 
implementation                 | implementation
                               | 
uses unit2;                    | uses unit1;
                               | 
procedure Proc1exec;           | procedure Proc2exec;
begin                          | begin
  unit2.Proc2;                 |   unit1.Proc1;
end;                           | end;
                               | 
procedure Proc1;               | procedure Proc2;
begin                          | begin  
end;                           | end;

During compilation of unit1 I get

ECompileError with message 'Unknown Name "unit1.Proc1"'

with the following text in IdwsProgram.Msgs.AsInfo:

Syntax Error: Unknown name "unit1.Proc1" [line: 14, column: 9, file: unit2]

Kindly explain how could I compile such circular referenced units.

Edit: In order to make the discussion closer to my requirements, I'll reformulate the question. Why DWScript does not allow me to compile these two units?

One solution is to put everything in one unit.

Another one is:

unit shared;

interface

procedure Proc1exec;
procedure Proc2exec;

implementation

uses unit1, unit2;

procedure Proc1exec;
begin
  unit1.proc1;
end;

procedure Proc2exec;
begin
  unit2.proc2;
end;

and

unit unit1;

interface

procedure Proc1;

implementation

procedure Proc1;
begin
  // do something useful
end;

end.

And something similar for unit2.

Now your code only has to include:

program Test;

uses
  unit1, unit2, shared;

begin
  Proc1exec;
  Proc2exec;
end.