$ perl -e'$foo=\"I am immutable"; $$foo="fie!";'
Modification of a read-only value attempted at -e line 1.
$

[download]

Is that what you want?

Update: Better yet, 

$ perl -e'*foo=\"I am immutable"; $foo="fie!";'
Modification of a read-only value attempted at -e line 1.
$

[download]

After Compline,
Zaxo

In reply to Re: There is a way to LOCK a SCALAR? by Zaxo
in thread There is a way to LOCK a SCALAR? by gmpassos

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