/in/foo.c: In function 'main':
/in/foo.c:9:17: warning: implicit declaration of function 'F' [-Wimplicit-function-declaration]
    9 |                 F(i=0)=0,F(i=1)=1;
      |                 ^
/in/foo.c:9:23: error: lvalue required as left operand of assignment
    9 |                 F(i=0)=0,F(i=1)=1;
      |                       ^
/in/foo.c:9:32: error: lvalue required as left operand of assignment
    9 |                 F(i=0)=0,F(i=1)=1;
      |                                ^
/in/foo.c:9:25: warning: left-hand operand of comma expression has no effect [-Wunused-value]
    9 |                 F(i=0)=0,F(i=1)=1;
      |                         ^
/in/foo.c:11:22: error: lvalue required as left operand of assignment
   11 |                 {F(i)=F(i-1)+F(i-2);}
      |                      ^
/in/foo.c:13:17: warning: implicit declaration of function 'primtf'; did you mean 'printf'? [-Wimplicit-function-declaration]
   13 |                 primtf("%||d",F(i));
      |                 ^~~~~~
      |                 printf