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This is a runtime contract/type checker for Erlang -spec declarations (*) This package allows for calling a function and checks that all contracts are valid. Also contains a command line version. > checker:run(M, F, Args). Runs a process where all calls to modules with -spec contracts will be checked before and after running the function. This behaviour is then recursively applied to any further function calls from the original callee. The contract checking behaviour will also be inherited by any spawned processes from the original call. Results from the contract checking will be logged using error_logger:format/2 and error_logger:info_msg/2. Note that all involved modules will have to be compiled with debug_info for the contract checking to function properly. Any module lacking debug_info will break the recursive chain (**). (*) It also contains a rudimentary converter from the old @spec declarations (see email@example.com) (**) This can of course be used as a feature since you may not always want to contract check the lists module.