Re: [tlaplus] Spurious coverage warning in TLC

[Markus Kuppe <tlaplus-google-group@xxxxxxxxxxx>]

On 19.03.19 20:14, Jonathan Ostroff wrote:
> In a simple 2-process mutex (see below) there are no errors but there is
> a coverage warning which is coloured yellow. Clicking on the warning
> points to the following line in the translation:
> 
> vars == << r, pc >>
> 
> TLC warns one when some action is never exercised during a run of the
> model checker. But here the warning appears to be meaningless because
> the definition of vars is not an action. 
> 
> Stephan suggested that I post here to mention the issue. He also
> mentions that he has seen similar examples of spurious warnings by TLC,
> but he ignores them. (However, knowing that an actual action is never
> executed is meaningful information.)
> 
> In a more complex _process_ version of mutex, the problem does not occur. 
> 


Hi Jonathan,

please see GitHub issue 152 [1] which tracks this problem.  Note that
the next TLC release will fix it.  You can download a nightly build from
[2] to verify the fix.

Thanks
Markus

[1] https://github.com/tlaplus/tlaplus/issues/152
[2] http://nightly.tlapl.us/

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