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#### 15.4.8.9 GDB and Modula-2

Some GDB commands have little use when debugging Modula-2 programs. Five subcommands of `set print` and `show print` apply specifically to C and C`++`: ‘`vtbl`’, ‘`demangle`’, ‘`asm-demangle`’, ‘`object`’, and ‘`union`’. The first four apply to C`++`, and the last to the C `union` type, which has no direct analogue in Modula-2.

The `@` operator (see Expressions), while available with any language, is not useful with Modula-2. Its intent is to aid the debugging of dynamic arrays, which cannot be created in Modula-2 as they can in C or C`++`. However, because an address can be specified by an integral constant, the construct ‘`{type}adrexp`’ is still useful.

In GDB scripts, the Modula-2 inequality operator `#` is interpreted as the beginning of a comment. Use `<>` instead.