/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:12:18: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define R(i,a,b) for(int i=(a),I=(b);i<I;i++)
                  ^
/in/foo.cc:37:3: note: in expansion of macro 'R'
   R(i,0,n) vis[i]=false; match(s)?dfs(J,s+1):void();
   ^
/in/foo.cc:37:26: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   R(i,0,n) vis[i]=false; match(s)?dfs(J,s+1):void();
                          ^~~~~