From @zoffixznet

This code produces an LTA error​:

  my %days := SetHash.new​: Date.today … Date.new​: '2030-04-02';
  %days ∖= %days.grep​: *.key.day-of-week > 5;

First, the error reads "Cannot modify an immutable SetHash" which is confusing,
since SetHash is a mutable type.

Second, the error dumps all of the contents of the SetHash, so for this code,
the user has to scroll several pages up just to get to the error itself.

From @lizmat

Fixed with b6a4d5b555520451c5c8a, this now DWIM, tests needed.

Error message being too long, fixed with 497e0582e6c64ccc04b2e9 .

On 23 Oct 2017, at 14​:28, Zoffix Znet (via RT) <perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by Zoffix Znet
# Please include the string​: [perl #​132353]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=132353 >

This code produces an LTA error​:

my %days := SetHash.new​: Date.today … Date.new​: '2030-04-02';
%days ∖= %days.grep​: *.key.day-of-week > 5;

First, the error reads "Cannot modify an immutable SetHash" which is confusing,
since SetHash is a mutable type.

Second, the error dumps all of the contents of the SetHash, so for this code,
the user has to scroll several pages up just to get to the error itself.

FWIW, I think a more readable version of this is​:

%days .= grep​: *.key.day-of-week > 5;

The RT System itself - Status changed from 'new' to 'open'

From @zoffixznet

On Mon, 23 Oct 2017 05​:28​:04 -0700, cpan@​zoffix.com wrote​:

This code produces an LTA error​:

my %days := SetHash.new​: Date.today … Date.new​: '2030-04-02';
%days ∖= %days.grep​: *.key.day-of-week > 5;

First, the error reads "Cannot modify an immutable SetHash" which is
confusing,
since SetHash is a mutable type.

Second, the error dumps all of the contents of the SetHash, so for
this code,
the user has to scroll several pages up just to get to the error
itself.

This no longer errors out.

Closing without tests, with the tests for new behaviour to be written when closing a related rakudo/rakudo#1203

@zoffixznet - Status changed from 'open' to 'resolved'