This paper describes the design and implementation of … Whenever a value is written into a location, … location's static type is compared with the value's … location is used, its run-time type tag is … used, an error message is issued. … The warning messages … [provide] information about what occurred prior to the … is usually succinct and precise in showing the … [p. 221] The run-time types that are tracked are: … [p. 230] The slowdowns we observe in these benchmarks … of comparison, the slowdown factor for Purify tends …
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