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GLOBAL
DECLARE Live : INTEGER
DECLARE Copies : INTEGER
ENDGLOBAL
CLASS Traced
Value : INTEGER
OVERLOAD PROCEDURE NEW()
Live <- Live + 1
ENDPROCEDURE
OVERLOAD PROCEDURE NEW(BYREF Other : Traced)
Value <- Other.Value
Live <- Live + 1
Copies <- Copies + 1
ENDPROCEDURE
PROCEDURE DELETE()
OUTPUT "destroy:", Value
Live <- Live - 1
ENDPROCEDURE
FUNCTION Read() RETURNS INTEGER
RETURN Value
ENDFUNCTION
FUNCTION Explode() RETURNS INTEGER
THROW
ENDFUNCTION
ENDCLASS
FUNCTION Make(N : INTEGER) RETURNS Traced
DECLARE Local : Traced
Local.Value <- N
RETURN Local
ENDFUNCTION
FUNCTION Forward(N : INTEGER) RETURNS Traced
RETURN Make(N)
ENDFUNCTION
PROCEDURE Pass(Item : Traced)
OUTPUT "pass:", Item.Value
Item.Value <- Item.Value + 10
ENDPROCEDURE
FUNCTION Fail() RETURNS INTEGER
THROW
ENDFUNCTION
PROCEDURE Accept(Item : Traced, Ignored : INTEGER)
ENDPROCEDURE
PROCEDURE Work()
DECLARE A : Traced
A.Value <- 1
CALL Pass(A)
CALL Pass(Forward(2))
CALL Make(3)
DECLARE B : Traced(A)
DECLARE C : Traced(Make(8))
OUTPUT Make(4).Read()
TRY
OUTPUT Make(6).Explode()
CATCH
OUTPUT "caught:", Live
ENDTRY
TRY
CALL Accept(Make(9), Fail())
CATCH
OUTPUT "argument caught:", Live
ENDTRY
OUTPUT "counts:", Copies, ":", Live
ENDPROCEDURE
CALL Work()
OUTPUT "remaining:", Live
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