[INHERIT('Interface_Module')]
PROGRAM Main_Program(INPUT,OUTPUT);

{ This program inherits the interface module.	}
{ Since just the implementation is modified	}
{ during development, the interface is		}
{ unchanged.  Therefore, this program does	}
{ not have to be recompiled.			}
{						}
{ The entire application is built using:	}
{						}
{ $ PASCAL INTERFACE_MODULE			}
{ $ PASCAL IMPLEMENTATION_MODULE		}
{ $ PASCAL MAIN_PROGRAM				}
{ $ LINK MAIN_PROGRAM, INTERFACE_MODULE, -	}
{ _$ IMPLEMENTATION_MODULE			}
{						}
{ Subsequent changes to the implementation	}
{ requires only compiling the module under	}
{ development and relinking:			}
{						}
{ $ PASCAL IMPLEMENTATION_MODULE		}
{ $ LINK MAIN_PROGRAM, INTERFACE_MODULE, -	}
{ _$ IMPLEMENTATION_MODULE			}
{						}

VAR
   A,B : Interesting_Type;

BEGIN
A := Make_One;
Invert_One(A,B);
Delete_One(A);
END.