Welcome to Counterexamples in Type Systems, a compendium of horrible programs that crash, segfault or otherwise explode.

The “counterexamples” here are programs that go wrong in ways that should be impossible: corrupt memory in Rust, produce a ClassCastException in cast-free Java, segfault in Haskell, and so on. This book is a collection of such counterexamples, each with some explanation of what went wrong and references to the languages or systems in which the problem occurred.

It’s intended as a resource for researchers, designers and implementors of static type systems, as well as programmers interested in how type systems fit together (or don’t).

Read in full here:

http://counterexamples.org/

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