Naked blocks are documented as being internally implemented as loops which are only executed once.¹
next is a loop control which reevaluates the condition, which is false now.
It's no goto, you can only use if for lables just in front of loop-starts, OTOH gotos can jump to any lables in the same scope.
For your purpose better try redo
redo if $x<6;
or real goto
goto X if $x<6;
A BLOCK by itself (labeled or not) is semantically equivalent t
+o a loop
that executes once. Thus you can use any of the loop control
statements in it to leave or restart the block.
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