clarify what is leaked even more

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Assessment

Difficulty
1/5
Estimated time
Under an hour
Newbie friendliness
72/100
Issue type
Documentation
Clarity
Clearly specified
Activity status
Stale
Tech stack
rust
Domain
documentation

Research direction

Start with src/leaking.md and read the paragraph containing “all that does is leak even more.” Clarify what additional data or state is leaked in the example, including the relationship to mem::forget(drainer), then verify that the revised wording resolves the question without changing the technical meaning.

Written by the indexing model from the issue text.

Description

it says below in https://github.com/rust-lang/nomicon/blob/master/src/leaking.md

all that does is leak even more (and possibly leave the Vec in an unexpected but otherwise consistent state).

As I understand, the remaining items in vec is leaked due to mem::forget(drainer), What is leaked even more in the example?

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