On Sun Mar 20 08:30:28 2016, awwaiid wrote:
> Here is an example that works as expected:
>
> > for ^2 { my $n = 5; say [+] (^$n X ^$n) }
> 50
> 50
>
> If we use constants to construct the Seq, it is not re-created on the
> second loop iteration:
>
> > for ^2 { say [+] (^5 X ^5) }
> 50
> This Seq has already been iterated, and its values consumed
> (you might solve this by adding .cache on usages of the Seq, or
> by assigning the Seq into an array)
> in block <unit> at <unknown file> line 1
>
> In my particular case after building the Seq I was applying map and grep to
> it which would change on each iteration -- it yells at me for the
> constant-Seq re-use even though I am doing different things with it each
> time.
>
Yeah, it was a constant folding issue. I've now made sure we don't try to do
that for things that produce a Seq, which fixes the issue. Test added to
S03-metaops/cross.t.
