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./delme.c:7:10: error: expected ';' after top level declarator
    7 | int func_##lett()
      |          ^
      |          ;
./delme.c:15:3: error: call to undeclared function 'func_n'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   15 |   func_n();
      |   ^
2 errors generated.