foo.cc:1:4: error: stray '#' in program
    1 |  1 #include<iostream>
      |    ^
foo.cc:2:4: error: stray '#' in program
    2 |  2 #include<string>
      |    ^
foo.cc:1:2: error: expected unqualified-id before numeric constant
    1 |  1 #include<iostream>
      |  ^
foo.cc:4:2: error: expected unqualified-id before numeric constant
    4 |  4
      |  ^
foo.cc:15:1: error: expected unqualified-id before numeric constant
   15 | 15
      | ^~

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