Yup, and perldoc perldebug mentions this fact. 

       Note that the said "eval" is bound by an implicit scope. As a r
+esult
       any newly introduced lexical variable or any modified capture b
+uffer
       content is lost after the eval. The debugger is a nice environm
+ent to
       learn Perl, but if you interactively experiment using material 
+which
       should be in the same scope, stuff it in one line.

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In reply to Re: Strange behavior of "my" in "perl -d" and "perl -de" by Fletch
in thread Strange behavior of "my" in "perl -d" and "perl -de" by johnnywang

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