foo.cc: In function 'int main()':
foo.cc:10:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(a=2; a<b; a++) 
  ^~~
foo.cc:13:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   if(a!=b)
   ^~