Bruce's issue with binding and raku -ne

[2colours]

This is just a cheap way for me to add a quick note: the binding issue seems to be tied to destructuring in particular; my \k = .split: "|"; will work just fine, my (\k, \l) = .split: "|"; will cause problems.

PS: By the way, could the Github Discussions tab turned on for this repo? It's probably simpler for adding notes like this than fully blown issues.

[jubilatious1]

Hi @2colours , the error I'm getting is "cannot assign to a read-only variable or value":

~$ cat ~/key_test_4_bruce.txt
1	KEY2
2	VAL21
3	VAL22
4	VAL23
5	VAL24

Now conventional sigil (works fine):

~$ raku -ne 'my ($k, $v) = .split: "\t"; say $k => $v;'  ~/key_test_4_bruce.txt
1 => KEY2
2 => VAL21
3 => VAL22
4 => VAL23
5 => VAL24

Now with "sigil-less" variables:

~$ raku -ne 'my (\k, \v) = .split: "\t"; say \k => \v;'  ~/key_test_4_bruce.txt
\("k" => \("KEY2"))
Cannot assign to a readonly variable or a value
  in block <unit> at -e line 1

Note: I tried hinting the compiler by adding a numeric parameter to split (telling split how many resultant elements are desired), and saw no improvement.

[2colours]

Hi @jubilatious1 , I can't see here where you are doing anything that involves sigilless variables without destructuring - the my \k = .split("\t"); part. Obviously, that won't do the same thing - but at this point, I don't think that matters too much; it's not relevant for the bug itself.

[jubilatious1]

Hi @2colours Let me try that:

% raku -ne 'my (\k, \v) = .split: "\t"; say \k , \v;'  ~/key_test_4_bruce.txt
\("1")\("KEY2")
Cannot assign to a readonly variable or a value
  in block <unit> at -e line 1

% raku -ne 'my \k  = .split: "\t"; say \k ;'  ~/key_test_4_bruce.txt
\(("1", "KEY2").Seq)
\(("2", "VAL21").Seq)
\(("3", "VAL22").Seq)
\(("4", "VAL23").Seq)
\(("5", "VAL24").Seq)
% raku -ne 'my \k  = .split("\t").List; say \k ;'  ~/key_test_4_bruce.txt
\(("1", "KEY2"))
\(("2", "VAL21"))
\(("3", "VAL22"))
\(("4", "VAL23"))
\(("5", "VAL24"))
% raku -ne 'my (\k,\v)  = .split("\t").List; say \k,\v ;'  ~/key_test_4_bruce.txt
\("1")\("KEY2")
Cannot assign to a readonly variable or a value
  in block <unit> at -e line 1