+ [q`<code>no utf8; $unicode</code>`, 'unicode overhaul: additional /\p{}/ properties'],
+ [q`<code>binmode $fh, ':perlio'</code>`, 'file handle behaviour altered by PerlIO layers'],
+ [q`<code>open $fh, '-|', @cmd</code>`, 'open list to fork a command without spawning a shell'],
+ [q`<code>open $fh, '>', \$var</code>`, 'perl scalars as virtual files'],
+ [q`<code>printf '%1$s', @args</code>`, 'syntax to use parameters out of order'],
+ [q`<code>1_2_3 == 123</code>`, 'underscores between digits allowed in numeric constants'],
+# [q`<code>use if</code>`, 'conditional module inclusion'], # also installable in earlier versions