Created attachment 127568 [details]
Demo mentioned in the OP
A function programmed in BASIC for use in Calc may have parameters declared optional. Positions of optional parameter may occur anywhere in the formal parameter list.
Calls to the function with omitted parameters from a BASIC Sub yield the expected results.
Calls from a formula evaluated for a Calc cell wrongly pass the numeric 0 for omitted optional parameters.
I only stumbled over the bug recently, but this in a case where I tried to get a function actually usable "in production". I could not find a promising workaround. The severity is therefore higher than normal from my point of view.
For trailing omitted optional parameters an error Err:511 is thrown by LibO V3.3 Calc if parameter separators are used. No separator, nothing passed. (This also is the behaviour of AOO up to 4.1.2.)
V3.5 and higher accept trailing omitted, even if there is a surplus in positions.
they then also pass a 0 for declared but omitted parameters and nothing for parameter positions in surplus.
See attached demo.
For clarification: The bug was found using V5.2.0. Only for the report here I also tried many old versions.
Ok I get this in the demo, so I guess it is not as expected:
Arch Linux 64-bit, KDE Plasma 5
Build ID: 65f2d6b1cc40b4b90f8987e8ea14d24b5f38f950
CPU Threads: 8; OS Version: Linux 4.7; UI Render: default;
Locale: fi-FI (fi_FI.UTF-8); Calc: group
Built on October 10th 2016
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Arch Linux 64-bit
Build ID: 37fc9f51a8de11d40632e8cda17ccf1fa4b1f503
CPU threads: 8; OS: Linux 5.2; UI render: default; VCL: gtk3;
Locale: fi-FI (fi_FI.UTF-8); UI-Language: en-US
Built on 6 August 2019
Eike: I intended to write that this all works as intended (except for extra arguments, which is related to bug 150422), but I couldn't find relevant piece in ODFF 1.3; 5.6 "Functions and Function Parameters" there doesn't define a value to use for empty parameter (which is what the "omitted" value *after the separator* is, according to the syntax there). 6.2 "Common Template for Functions and Operators" also doesn't talk about value used in place of empty parameter.