M2 Defaults (Debugging with GDB)
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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.
