[perl #112838] [BUG] 'let' doesn't revert the value of variables in the case of 'fail' from a routine in Rakudo

[Carl Mäsak via RT]

<moritz> r: sub f { UNDO say 'leaving A' ; fail "foo"; }; f
<p6eval> rakudo 24ffc9:  ( no output )
<masak> yeah. should trigger.
<moritz> same underlying cause
<jnthn> Hmm, what underlies that one?
<moritz> because let uses an UNDO to restore the state
<jnthn> And UNDO...doesn't trigger here?