Someone has recently (since 6.8.3) taken a "style" pass over
`IntMap.hs`.
Apparently they didn't like reusing identifiers in different scopes,
The reason someone made this change was to eliminate compiler warnings
with -Wall, and as you rightly point out, the refactoring has
introduced a new bug where there was no bug before (and there is no
warning for this new bug).
I think this illustrates the danger of the belief that warnings are
themselves signs of danger. Sometimes a warning is simply an
arbitrary style choice, and it is good practice to ignore it (or
silence it) rather than change the code.
Regards,
Malcolm
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