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In my previous article I mentioned that OCaml’s Stdlib leaves a lot to be desire when it comes to regular expressions. One thing I didn’t discuss back then was that the problem is somewhat mitigated by the excellent module Scanf, which makes it easy to parse structured data.
A few months ago, a memory leak in the Scanf.fscanf function of OCaml’s standard library has been reported on the OCaml mailing list. The following “minimal” example reproduces this misbehavior: Let us see how to identify the origin of the leak and fix it with our OCaml memory profiler. Instal...