Pun is an extension of a minimal garden variety functional programming langauge (similar to the Fun langauge from Pierce's "Types and Progamming Languages", and the REC language from Glynn Winskel's "The Formal Semantics of Programming Langauges").
The main feature is a property declaration, which has the form:
propery <name> <parameters> . <term> .that lets the programmer specify properties to be checked by QuickCheck,
only that rather than having to write a generator by hand, the pun
interpreter will generate terms to substitute in for the parameters.
Example, here is a property.
property plus-is-commutative m n . m + n = n + m .Which will check that the term m + n = n + m normalizes to true for a
suitable handful of choices of m and n that make the term well-typed.
Assuming that you have the haskell build-tool stack installed.
You should be able to install pun by running
> stack installfrom within the repository.
To typecheck a a program, run:
> pun --types <program-name>.punand start typing in terms to evaluate.
To run the properties specified in a program, pass the flag --check like so:
> pun --check <program-name>.punthe folder ./examples contains a number of example programs to get you started.