Here is an odd piece in deed. Apparently it is dependent on the actual names you are using in that they contain a _. I have no idea why but check this out.
C:\Perl\Tests>perl -c -e"$var = { aa...aaaa}"
-e syntax OK
C:\Perl\Tests>perl -c -e"$var = { aa...aaaa_}"
C:\Perl\Tests>perl -c -e"$var = { 'aa'...'aaaa_'}"
C:\Perl\Tests>
The last two had to be killed as they consumed all the processors power. The first flew through in no time, obviously not computing. So some little thing is causeing the _ to make it actualy execute that code.
BTW C:\Perl\Tests>perl -c -e"'aa'...'aaaa_'" without the hash ref doesn't cause any delay, and checks out perfectly.
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