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extern int x1f4_test_expression
    (void *x1f4_expression);

The x1f4_test_expression function returns 0 if the x1f4_expression expression is atomic and constant and evaluates to one of the proper intrinsic types, i.e. it is a cardinal constant, an integer constant, a real constant or a string constant, non zero otherwise.

See Intrinsic Types.

See Expression Syntax.