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use strict;
use warnings;
...
    given param2.2 -> child of "given param2"
      given param2.2.1 -> child of "given param2.2"
  given param3 -> child of "interface XYZ"

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Output: [
  {
...
    ],
  },
] at d:/tmp/parse_indent.pl line 55, <DATA> line 7.