a0fdee59b4
* Add support for space-efficient vector and arrow contracts. When an eleventh contract would be applied to a function or vector, switch representation for the wrapper and try eliding redundant checks. The resulting value keeps a constant number of chaperone/impersonator wrappers regardless of the number of contracts applied to it, and won't run any (provably) redundant checks. This avoids a pathological case where, e.g., a function crosses a boundary inside a loop, and gets wrapped N times (or worse, 2^N). The optimization for function contracts currently only applies for fixed-arity functions and contracts, and only for functions with known result-arity of 1. These limitations are not fundamental. Checking specific checks is not as optimized as for regular arrow contracts yet. (Specifically: arity-specific wrappers and tail-marks-match support is missing.) Again, not a fundamental limitation. Further described in the OOPSLA 2018 Paper: "Collapsible Contracts: Fixing a Pathology of Gradual Typing" In collaboration with Ben Greenman, Christophe Scholliers, Robby Findler, and Vincent St-Amour. |
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| INSTALL.txt | ||
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| README.md | ||
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