The Glasgow Functional Programming Group is widely recognised for its research in lazy functional languages. Once again this year, for the fifth time, we retreated to a Scottish seaside town to discuss our latest work, this time spending three days in Ayr. We were joined by a number of colleagues from other universities and from industry, with whom we have been enjoying fruitful collaboration. The workshop serves the dual purpose of ensuring that the whole group remains informed of each other's work, and of providing workshop experience for research students. Most participants presented a short talk about their work, supplemented by papers which appeared in a draft proceedings distributed at the workshop. Since then the papers have been reviewed and the majority are now published here following revision. The workshop also contained a lively discussion session on functional language applications, to which the industrial participants made very helpful contributions. One interesting feature of this volume is the number of papers addressing practical issues of realistic use of functional languages, from benchmarking and profiling, to user interfaces and file handling. It is perhaps indicative that at last lazy functional languages are being used for significantly larger applications than has been typical in the past. This type of paper is likely to feature prominently in relevant conference proceedings for the next few years. Other papers here continue to address more theoretical topics, such as program logic, semantics of non­ determinism, program analysis, and loop detection.

Inhalt

High Level Specification of I/O in Functional Languages.- GRIT: Guy's RISC Implementation of the Three Instruction Machine.- A Logical Framework for Program Analysis.- Analysing Functions by Projection-Based Backward Abstraction.- Abstract Interpretation of Higher Order Functions Using Concrete Data Structures (Summary).- The Glasgow Haskell Compiler: A Retrospective.- Improving Persistent Data Manipulation for Functional Languages.- A Loop-Detecting Interpreter for Lazy, Higher-Order Programs.- A Semantics for Locally Bottom-Avoiding Choice.- A Certain Loss of Identity.- Programming with Constructor Classes (Preliminary Summary).- Combining Monads.- Avoiding Unnecessary Updates.- Deforestation for Higher-Order Functions.- Hazard Algebra and the Design of Asynchronous Automata.- Generating Netlists from Executable Circuit Specifications in a Pure Functional Language.- The nofib Benchmark Suite of Haskell Programs.- Heap Profiling of a Lazy Functional Compiler.- LZW Text Compression in Haskell.- Profiling Lazy Functional Programs.- On Program Transformation in the Glasgow Haskell Compiler.- Graphical User Interfaces for Haskell.- Formulating Haskell.- Author Index.