/in/foo.cc: In function 'int main()':
/in/foo.cc:4:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
 #define M (L+R+1>>1)
            ~~~^~
/in/foo.cc:26:12: note: in expansion of macro 'M'
   if(check(M))
            ^
/in/foo.cc:4:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
 #define M (L+R+1>>1)
            ~~~^~
/in/foo.cc:27:6: note: in expansion of macro 'M'
    L=M;
      ^
/in/foo.cc:4:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
 #define M (L+R+1>>1)
            ~~~^~
/in/foo.cc:29:6: note: in expansion of macro 'M'
    R=M-1;
      ^