This page contains information for Dialyzer, the DIscrepancy AnaLYZer for ERlang applications.
Dialyzer is a static analysis tool that identifies software discrepancies such as definite type errors, code which has become dead or unreachable due to some programming error, unnecessary tests, etc. in single Erlang modules or entire (sets of) applications. Dialyzer starts its analysis from either debug-compiled BEAM bytecode or from Erlang source code. The file and line number of a discrepancy is reported along with an indication of what the discrepancy is about. Dialyzer bases its analysis on the concept of success typings which allows for sound warnings (no false positives).
Since 2007, Dialyzer is included in the official Erlang/OTP distribution.
You can find more information on how to use Dialyzer here.