> Assignment is a right-to-left operation

That's right, but sorry you are overcomplicating things.

Precedence isn't relevant here: 

 DB<1> use strict; my $N = $N;
Global symbol "$N" requires explicit package

[download]

Declarations are only effective after the statement, in this case behind the semicolon.

This was done to allow accessing equally named variables from a surrounding scope.

See perlsub#Private-Variables-via-my()

The declared variable is not introduced (is not visible) until after the current statement. Thus, 

 my $x = $x;

can be used to initialize the new $x with the value of the old $x, and the expression 

 my $x = 123 and $x == 123

is false unless the old $x happened to have the value 123.

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

In reply to Re^2: Strange compile error? by LanX
in thread Strange compile error? by gelbukh

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