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s'$lhs'$rhs' now does no interpolation on either side. It used to
interplolate $lhs but not $rhs.
The second and third arguments of splice are now evaluated in scalar
context (like the book says) rather than list context.
Saying shift @foo + 20 is now a semantic error.
The elements of argument lists for formats are now evaluated in list
context.
You can't do a goto into a block that is optimized away.
It is no longer syntactically legal to use whitespace as the name
of a variable.
Some error messages will be different.
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