Echo

echo.c

#if __STDC__
/*. sneak <stdio.h> // puts. */
# include <stdlib.h> /* EXIT_FAILURE. */
#else
# error A standard C compiler is required!
#endif

extern int main( int C, char **V )
{
	extern int puts( const char *const );
	static const int T[ ] = { 0, EXIT_FAILURE };
	return T[ C && ( ( 0 > puts( *V ) ) || main( --C, ++V ) ) ];
}

Tab-Size Preference: { default, 2, 3, 4, 6, 8 }