Idiom #369 makes no sense?

[Bart-B]

Idiom #369 Parse matching brackets

None of the provided wiki links seem to have any bearing on the given task.
At last I could not find any refernce to what it is supposed to do.
The expected output seems to have no logical relation to the given input.
(Well, I'm not a mathematicion or anything the like, so I may very well be totally wrong)
(And, the issue tracker may not be the right place to complain about this, but I saw no other way. It seems to be the only way to contact you)

[simonvonhackewitz]

It is the position of an opening bracket with the position of the corresponding closing bracket.

[Bart-B]

"{ { } } { }" is (0, 6) (2, 4) (8, 10).

0 is closed by 3
1 is closed by 2
4 is closed by 5

The solution doesn't make sense (to me).

[simonvonhackewitz]

The string contains spaces :)

[Bart-B]

The string contains spaces :)

Feeling a bit emberassed now...