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TLC reports zero coverage for conjunct of the next-state action
See original GitHub issueTLC reports 0 coverage for the indicated conjunct of the next-state action below:
VARIABLE x
Spec == /\ x = 0
/\ [][/\ x' = (x+1)%5
/\ x' = (x+1)%5 \* <- 0 coverage
]_x
This is an oversimplification of a problem that occurred in a real spec. A slightly more complicated example indicates how it can arise in practice.
/\ A
/\ \/ /\ x' # x
/\ ...
\/ /\ x' = x \* <- 0 coverage
/\ ...
where
A == \/ /\ ...
/\ x' = ...
/\ ...
\/ /\ ...
/\ x' = x
/\ ...
Related, TLC reports zero coverage for the (automatically) generated vars = <<x,y,z>> definition of PlusCal unless vars appears as part of an UNCHANGED statement (see issue #152).
Issue Analytics
- State:
- Created 6 years ago
- Comments:24 (24 by maintainers)
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Please add a JUnit test with a spec that shows the problem. The test class should be derived from https://github.com/tlaplus/tlaplus/blob/master/tlatools/test/tlc2/tool/liveness/ModelCheckerTestCase.java (don’t mind liveness in the package name)
Obsolete due to f11c4ad92b0cdb5c3b1d918055c17bf64c8b0a93