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