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Bug #767

Labels and line numbers can't be referenced from a Gosub inside a Procedure or Function.

Added by Brian Flanagan 20 days ago.

Status:
New
Priority:
High
Assignee:
-
Target version:
Start date:
05/30/2021
Due date:
% Done:

0%

Estimated time:
3.00 h
Affected version:

Description

This affects both the AOZ and Amiga manifests.

By definition, Labels and Line numbers should be Global.
Apparently, now, they are not. (These used to work.)

Problem with labels:

DoProcedure[1,2,3]
End

DoStuff:
    Print "Stuff"
Return

Procedure DoProcedure[a,b,c]
    Print a,b,c
    Gosub DoStuff
End Procedure

The above produces an Internal Error.

Modifying the code to use a line number instead of a label is revealing.

DoProcedure[1,2,3]
End

100 Print "Stuff"
Return

Procedure DoProcedure[a,b,c]
    Print a,b,c
    Gosub 100
End Procedure

Now the error message is "label not defined".

Similar results occur inside functions:

With labels:

result=DoFunction(1,2,3)
If result>0 Then Print result

End

DoStuff:
    Print "Stuff"
Return

Function "DoFunction",a,b,c
    Print a,b,c
    Gosub DoStuff
    done=123
End Function(done)

...and with line numbers.

result=DoFunction(1,2,3)
If result>0 Then Print result

End

100 Print "Stuff"
Return

Function "DoFunction",a,b,c
    Print a,b,c
    Gosub 100
    done=123
End Function(done)

From these tests, my assumption is that neither named labels, nor line numbers are functioning globally.

IMO, labels should have the same scope as where they are defined.
Any label or line number defined in the global scope should be, by definition, a global label/line number.

Since, in these examples, both the Line Number and the Label's scope is global, so they should be accessible inside procedures and functions.

Just FYI: In AMOS Pro, Gosub to a line number from inside a Procedure worked fine.
(Labels did not work. Apparently AMOS had the same problem as AOZ with global named labels.)

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