Sequence examples no longer work as advertised / section could use improvement

[dod38fr]

Hello

In page http://doc.perl6.org/language/list#Sequences , the following example:

  my @s := (loop { 42.say }); # Error expected Positional but got Seq

triggers an endlees loop instead of the error mentioned in comment (tested with rakudo 2016.03).

Although I can't say if this is a bug or a documentation error.

All the best

[zoffixznet]

Looks like that whole section needs to be rewritten. None of the examples with binding produce described results, so I think the behavior of loop in such form has changed.

Also, using only the loop {...} to make a sequence leaves out much neater things like the sequence operator: 0, 2 ... * might be a better example to use, or at least it should be mentioned. It also works with the binding examples, although the part demonstrating how elements get generated becomes undemonstrative.

[JJ]

That page has evolved, and that particular example works as advertised. Can you please check if it's OK now, or suggest changes?

[zoffixznet]

This example is wrong:

my @s := Seq.new(<a b c>); CATCH { default { say .^name, ' ', .Str } }
# OUTPUT «Type check failed in binding to $iter; expected Iterator but got List ($("a", "b", "c"))␤  in block <unit> at <tmp> line 1␤␤» 

It's trying to show that you can't bind a Seq to a Positional variable, but it's constructing the Seq incorrectly and gets the wrong error. It's meant to be <a b c>.Seq and then the error message will be different; actually saying that you can't bind stuff.

Although I can't say if this is a bug or a documentation error.

It's a known bug. IIRC it's trying to reify the Seq with .perl to show a bit of its guts in the error message and ends up reifying forever.