Not all patterns, but enough
Neil Mitchell, Colin Runciman · 2008
We describe an automated analysis of Haskell 98 programs to check statically that, despite the possible use of partial (or nonexhaustive) pattern matching, no pattern-match failure can occur. Our method is an iterative backward analysis using a novel form of pattern-constraint to represent sets of data values. The analysis is defined for a core first-order language to which Haskell 98 programs are reduced. Our analysis tool has been successfully applied to a range of programs, and our techniques seem to scale well. Throughout the paper, methods are represented much as we have implemented them in practice, again in Haskell.