Changelog for quickcheck-dynamic-3.4.2

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

As a minor extension, we also keep a semantic version for the UNRELEASED changes.

Added some lightweight negative-shrinking based on a simple dependency analysis.
Added the option to return errors from actions by defining type Error state. When this is defined perform has return type m (Either (Error state) (Realized m a)), when it is left as the default the type remains m (Realized m a).
Changed withGenQ to require a predicate when defining a Quantification. Note: This is technically a breaking change as the interface changed

Added support for negative testing via validFailingAction and postconditionOnFailure callbacks in StateModel and RunModel.

Added instances for HasVariables with custom error messages to avoid the issue of missing Generic instances causing difficult to understand type errors.

BREAKING: Change the type of postcondition to allow you to express property monitoring (e.g. stats or counterexamples) in the postcondition itself - rather than duplicating code for counterexamples in the monitoring function.

Added hasNoVariablesQ and forAllNonVariableDL functions to help make quantification require less boilerplate in DL properties.

Added instances of HasVariables for Word types
Exported definition of HasNoVariables to make it useable with deriving via in downstream packages (whoops!)
Fixed impossible to use nextVar arguments to forAllUniqueDL

BREAKING: Add HasVariables class to keep track of symbolic variables and automatically insert precondition checks for well-scopedness of variables.
BREAKING: Remove some unnecessary and unusead features in dynamic logic, including re-running tests from a counterexample directly.
Improved printing of counterexamples in DL - they are now printed as code that can be copied more-or-less verbatim to create a runnable counterexample in code.
Made the variable context explicit to avoid having to keep track of symbolic variables in the model
- This introduces the ctxAtType and arbitraryVar functions to use in action generators (c.f. the RegistryModel.hs example).

BREAKING: Add Realized type family to distinguish between the model- and real type of an action
BREAKING: Introduce RunModel type class to interpret Model-generated sequence of actions against real-world implementation
- Move perform method from StateModel to this new type-class
- Also split postcondition and monitoring out from the StateModel to the RunModel type class
Added Thread registry example based on io-sim concurrency simulation library

Fix broken links in Hackage-generated documentation and link to other Quviq papers
Add Show a constraint on monitoring

Initial publication of quickcheck-dynamic library on Hackage
Provide base StateModel and DynamicLogic tools to write quickcheck-based models, express properties, and test them