I'm not sure what this error message means and what is going on here:
perl6 --version
This is Rakudo version 2017.08 built on MoarVM version 2017.08.1
implementing Perl 6.c.
$ cat tt-h.p6
#!/usr/bin/env perl6
my %excludes = "exclude" => "exclude";
my %all = :keep("keep"), :exclude("exclude"), :remove("remove");
my %remove = :remove("remove");
my Set $take1 = (%all (-) %remove) (-) %excludes;
dd $take1;
my Set $take2 = %all (-) %remove (-) %excludes;
dd $take2;
$ ./tt-h.p6
Set $take1 = set("keep")
Cannot convert string to number: base-10 number must begin with valid
digits or '.' in '⏏remove' (indicated by ⏏)
in block <unit> at ./tt-h.p6 line 10
The difference in $take1 and $take2 are the brackets around the 1st set
operation.
If I use arrays then no problem with either expression:
$ cat tt-a.p6
#!/usr/bin/env perl6
my @excludes = "exclude";
my @all = "keep", "exclude", "remove";
my @remove = "remove";
my Set $take1 = (@all (-) @remove) (-) @excludes;
dd $take1;
my Set $take2 = @all (-) @remove (-) @excludes;
dd $take2;
$ ./tt-a.p6
Set $take1 = set("keep")
Set $take2 = set("keep")
--
Norman Gaywood, Computer Systems Officer
School of Science and Technology
University of New England
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ngayw...@une.edu.au http://turing.une.edu.au/~ngaywood
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