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/* n_nularg.t: Empty argument of macro call. */
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#define ARG( a) # a
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#define EMPTY
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#define SHOWN( n) printf( "%s : %d\n", # n, n)
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#define SHOWS( s) printf( "%s : %s\n", # s, ARG( s))
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#define add( a, b) (a + b)
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#define sub( a, b) (a - b)
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#define math( op, a, b) op( a, b)
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#define APPEND( a, b) a ## b
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/* printf( "%s : %d\n", "math( sub, , y)", ( - y)); */
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SHOWN( math( sub, , y));
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/* printf( "%s : %s\n", "EMPTY", ""); */
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SHOWS( EMPTY);
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/* printf( "%s : %s\n", "APPEND( CON, 1)", "CON1"); */
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SHOWS( APPEND( CON, 1));
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/* printf( "%s : %s\n", "APPEND( CON, )", "CON"); */
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SHOWS( APPEND( CON, ));
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/* printf( "%s : %s\n", "APPEND( , )", ""); */
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SHOWS( APPEND( , ));
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