foo.cc:1:1: error: 'procedure' does not name a type
    1 | procedure dfs ( x : longint ) ;
      | ^~~~~~~~~
foo.cc:3:1: error: 'begin' does not name a type
    3 | begin
      | ^~~~~
foo.cc:7:1: error: 'l' does not name a type
    7 | l[x] = cnt ;
      | ^
foo.cc:9:1: error: expected unqualified-id before 'for'
    9 | for i = each son of x do dfs ( i )
      | ^~~
foo.cc:13:1: error: 'r' does not name a type
   13 | r[x] = cnt;
      | ^
foo.cc:15:1: error: 'end' does not name a type
   15 | end ;
      | ^~~

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