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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. is either an integer constant,
either a real constant, either a string constant, non zero
otherwise.
See Intrinsic Types.
See Syntax.