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##### 15.4.9.5 Modula-2 Defaults

If type and range checking are set automatically by gdb, they both default to `on` whenever the working language changes to Modula-2. This happens regardless of whether you or gdb selected the working language.

If you allow gdb to set the language automatically, then entering code compiled from a file whose name ends with `.mod` sets the working language to Modula-2. See Having gdb Infer the Source Language, for further details.