$ perl -wle'use strict; map +(my $x = $_), 2; print $x'
Use of uninitialized value in print at -e line 1.

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It seems a run-time scope is created for map EXPR,.

Incorrect.    What is happening is the same thing that happens when you do that with a foreach statement modifier: 

$ perl -wle'use strict; my $x = $_ for 2; print $x'
Use of uninitialized value $x in print at -e line 1.

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Braces or file boundaries are the only things that can create scope.

In reply to Re^3: syntax of map operator by jwkrahn
in thread syntax of map operator by sman

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