I'm also fine with this. As for the syntax...
> vec::each(v) {|e| ... }
This once again produces ambiguity with fail and ret: does 'fail {|e|
...}' mean 'call the function produced by fail with this block', or
'fail with this block as the message'. Can be hacked around, or we can
just specify that the second version holds, but it's a wart.
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