perl feed subs from right to left,
I don't know what that means? Both sub definitions and sub calls read from left to right.
Perl do checks if tail-loaded,
No, that's not the case for either the do function or the do block. Both start with do. They read from left to right.
Are you talking about do ... if ...;, do ... for ...; and , do ... while ...;? Those are just statement modifiers on a expression. No different than next if ...;, etc.
And again, you keep giving examples that defy your point. do ... while ...; is rarely used, I've never seen the others used, and I actively avoid them all.
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