/in/foo.cc: In function 'int main()':
/in/foo.cc:15:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(i=1;i<lena+lenb;i++)
     ^~~
/in/foo.cc:21:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  len=lena+lenb;
  ^~~