Whateverable/query

## query
say 42

## result.md

      
    Raw
  

              result.md
            
          
    An operation first awaited:
  in sub  at /home/bisectable/git/whateverable/lib/Whateverable.pm6 (Whateverable) line 59 (⚠ uncommitted)
  in code  at /home/bisectable/git/whateverable/lib/Whateverable.pm6 (Whateverable) line 58 (⚠ uncommitted)

Died with the exception:
    A react block:
      in sub get-output at /home/bisectable/git/whateverable/lib/Whateverable/Output.pm6 (Whateverable::Output) line 51
      in sub get-tags at /home/bisectable/git/whateverable/lib/Whateverable/Builds.pm6 (Whateverable::Builds) line 152
      in sub get-commits at /home/bisectable/git/whateverable/lib/Whateverable/Builds.pm6 (Whateverable::Builds) line 183
      in sub process at xbin/Committable.p6 line 78
      in code  at xbin/Committable.p6 line 67

    Died because of the exception:
        Failed to spawn process git: no such file or directory (error code -2)
          in sub get-output at /home/bisectable/git/whateverable/lib/Whateverable/Output.pm6 (Whateverable::Output) line 51
          in sub get-tags at /home/bisectable/git/whateverable/lib/Whateverable/Builds.pm6 (Whateverable::Builds) line 152
          in sub get-commits at /home/bisectable/git/whateverable/lib/Whateverable/Builds.pm6 (Whateverable::Builds) line 183
          in sub process at xbin/Committable.p6 line 78
          in code  at xbin/Committable.p6 line 67

  
## uncommitted-Whateverable.pm6
# Copyright © 2016-2017
#     Aleks-Daniel Jakimenko-Aleksejev <alex.jakimenko@gmail.com>
# Copyright © 2016
#     Daniel Green <ddgreen@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

use File::Directory::Tree;
use IRC::Client::Message;
use IRC::Client;
use IRC::TextColor;
use JSON::Fast;
use Number::Denominate;
use Pastebin::Gist;
use Terminal::ANSIColor;
use Text::Diff::Sift4;

use Whateverable::Bits;
use Whateverable::Configurable;
use Whateverable::Config;
use Whateverable::Discordable;
use Whateverable::Heartbeat;
use Whateverable::Messages;
use Whateverable::Processing;

constant Message = IRC::Client::Message;

unit role Whateverable does IRC::Client::Plugin;

also does Helpful;
also does Whateverable::Configurable;
also does Whateverable::Discordable;

method TWEAK {
    # wrap around everything to catch exceptions
    once { # per class
        self.^lookup(‘irc-to-me’).wrap: sub ($self, $msg) {
            return if $msg.?channel and $msg.channel ne $CONFIG<cave>
                      and $msg.args[1].starts-with: ‘what:’;
            # ↑ ideally this check shouldn't be here, but it's much harder otherwise

            LEAVE sleep 0.02; # https://github.com/Raku/whateverable/issues/163
            try {
                my $result = callsame;
                return without $result;
                return $result but Reply($msg) if $result !~~ Promise;
                return start sub {
                    my $awaited = try await $result;
                    return handle-exception $_, $msg with $!;
                    return without $awaited;
                    return $awaited but Reply($msg);
                }()
            }
            handle-exception $!, $msg
        };

        self.^lookup(‘filter’).wrap: sub ($self, $response) {
            my &filter = nextcallee;
            try { return filter $self, $response }
            return ‘Ow! Where's a camcorder when ya need one?’ if $response ~~ Enough;
            try { return filter $self, handle-exception $!, $response.?msg }
            ‘Sorry kid, that's not my department.’
        };
    }
    # TODO roles should not have TWEAK method
}

#↓ STDIN reset
multi method irc-to-me(Message $msg where .text ~~
                       #↓ Matches only one space on purpose (for whitespace-only stdin)
                       /:i^ [stdin] [‘ ’|‘=’] [clear|delete|reset|unset] $/) {
    $CONFIG<stdin> = $CONFIG<default-stdin>;
    ‘STDIN is reset to the default value’
}
#↓ STDIN set
multi method irc-to-me(Message $msg where .text ~~ /:i^ [stdin] [‘ ’|‘=’] $<stdin>=.* $/) {
    my $file = process-code ~$<stdin>, $msg;
    $CONFIG<stdin> = $file.slurp;
    unlink $file;
    “STDIN is set to «{shorten $CONFIG<stdin>, 200}»” # TODO is 200 a good limit
}
#↓ Source
multi method irc-to-me(Message $    where .text ~~ /:i^ [source|url] ‘?’? \s* $/) { $CONFIG<source> }
#↓ Wiki
multi method irc-to-me(Message $    where .text ~~ /:i^ wiki ‘?’? \s* $/) { self.get-wiki-link }
#↓ Help
multi method irc-to-me(Message $msg where .text ~~ /:i^ [help|usage] ‘?’? \s* $/) {
    self.help($msg) ~ “ # See wiki for more examples: {self.get-wiki-link}”
}
#↓ Uptime
multi method irc-to-me(Message $msg where .text ~~ /:i^ uptime \s* $/) {
    use nqp;
    use Telemetry;
    (denominate now - $*INIT-INSTANT) ~ ‘, ’
    ~ T<max-rss>.fmt(‘%.2f’) ÷ 1024 ~ ‘MiB maxrss. ’
    ~ (with (nqp::getcomp("Raku") || nqp::getcomp("perl6")) {
        “This is {.implementation} version {.config<version>} ”
        ~ “built on {.backend.version_string} ”
        ~ “implementing {.language_name} {.language_version}.”
     })
}
#| You're welcome!
sub you're-welcome is export {
    «
    ‘You're welcome!’
    ‘I'm happy to help!’
    ‘Anytime!’
    ‘It's my pleasure!’
    ‘Thank you! You love me, you really love me!’
    ‘\o/’
    »
}
#| Replying to thanks
multi method irc-to-me(Message $msg where .text ~~ /:i^ [‘thank you’|‘thanks’] \s* /) {
    you're-welcome.pick
}
#| Replying to thanks
multi method irc-privmsg-channel($msg where .text ~~ /:i [‘thank you’|‘thanks’] .* $($msg.server.current-nick) /) {
    you're-welcome.pick
}
#↓ Notices
multi method irc-notice-me( $ --> Nil)                             {} # Issue #321
#↓ Private messages
method private-messages-allowed() { False }
multi method irc-privmsg-me($ where not $.private-messages-allowed) { # TODO issue #16
    ‘Sorry, it is too private here. You can join #whateverable channel instead’
}
#↓ Fallback
multi method irc-to-me($) {
    ‘I cannot recognize this command. See wiki for some examples: ’ ~ self.get-wiki-link
}
#↓ Notify watchdog on any event
multi method irc-all($) {
    # TODO https://github.com/zoffixznet/perl6-IRC-Client/issues/50
    I'm-alive;
    $.NEXT
}

method get-wiki-link { $CONFIG<wiki> ~ self.^name }

#↓ Gistable output
multi method filter($response where
                    (.encode.elems > $CONFIG<message-limit>
                     or (!~$_ and # non-empty are not gisted unless huge
                         (?.?additional-files or $_ ~~ ProperStr)))) {
    # Here $response is a Str with a lot of stuff mixed in (possibly)
    my $description = ‘Whateverable’;
    my $text = colorstrip $response.?long-str // ~$response;
    my %files;
    %files<result> = $text if $text;
    %files.push: $_ with $response.?additional-files;

    if $response ~~ Reply {
        $description = $response.msg.server.current-nick;
        %files<query> = $_ with $response.?msg.?text;
        %files<query>:delete unless %files<query>;
    }
    my $url = upload %files, public => !%*ENV<DEBUGGABLE>, :$description;
    $url = $response.link-msg()($url) if $response ~~ PrettyLink;
    $url
}

#↓ Regular response (not a gist)
multi method filter($text is copy) {
    ansi-to-irc($text)
    .trans([“\r\n”] => [‘␍␤’])
    .trans:
        “\n” => ‘␤’,
        3.chr => 3.chr, 0xF.chr => 0xF.chr, # keep these for IRC colors
        |((^32)».chr Z=> (0x2400..*).map(*.chr)), # convert all unreadable ASCII crap
        127.chr => ‘␡’, /<:Cc>/ => ‘␦’
}

#↓ Gists %files and returns a link
sub upload(%files is copy, :$description = ‘’, Bool :$public = True) is export {
    if %*ENV<TESTABLE> {
        my $gists-path = %*ENV<TESTABLE_GISTS>;
        rmtree $gists-path if $gists-path.IO ~~ :d;
        mkdir $gists-path;
        spurt “$gists-path/{.key}”, .value for %files;
        return ‘https://whatever.able/fakeupload’;
    }

    %files = %files.pairs.map: { .key => %( ‘content’ => .value ) }; # github format

    my $gist = Pastebin::Gist.new(token => $CONFIG<github><access_token> || Nil);
    return $gist.paste: %files, desc => $description, public => $public
}

#↓ Sets things up and starts an IRC client
method selfrun($nick is copy, @alias?) {
    ensure-config;

    use Whateverable::Builds;
    ensure-cloned-repos;

    sleep rand × $CONFIG<join-delay> if none %*ENV<DEBUGGABLE TESTABLE>;

    $nick ~= ‘test’ if %*ENV<DEBUGGABLE>;
    .run with IRC::Client.new(
        :$nick
        :userreal($nick.tc)
        :username($nick.substr(0, 3) ~ ‘-able’)
        :password(?%*ENV<TESTABLE> ?? ‘’ !! $CONFIG<irc><login password>.join: ‘:’)
        :@alias
        # IPv4 address of chat.freenode.net is hardcoded so that we can double the limit ↓
        :host(%*ENV<TESTABLE> ?? ‘127.0.0.1’ !! <irc.libera.chat 93.158.239.37>.pick)
        :port(%*ENV<TESTABLE> ?? %*ENV<TESTABLE_PORT> !! 6667)
        :channels(%*ENV<DEBUGGABLE>
                  ?? $CONFIG<cave>
                  !! %*ENV<TESTABLE>
                     ?? “#whateverable_$nick”
                     !! (|$CONFIG<channels>, $CONFIG<cave>) )
        :debug(?%*ENV<DEBUGGABLE>)
        :plugins(self)
        :filters( -> |c { self.filter(|c) } )
    )
}

# vim: expandtab shiftwidth=4 ft=perl6

## |git-diff-HEAD.patch
diff --git a/lib/Whateverable.pm6 b/lib/Whateverable.pm6
index 1dd7d80..e61451a 100644
--- a/lib/Whateverable.pm6
+++ b/lib/Whateverable.pm6
@@ -215,7 +215,7 @@ method selfrun($nick is copy, @alias?) {
         :password(?%*ENV<TESTABLE> ?? ‘’ !! $CONFIG<irc><login password>.join: ‘:’)
         :@alias
         # IPv4 address of chat.freenode.net is hardcoded so that we can double the limit ↓
-        :host(%*ENV<TESTABLE> ?? ‘127.0.0.1’ !! <chat.freenode.net 195.154.200.232>.pick)
+        :host(%*ENV<TESTABLE> ?? ‘127.0.0.1’ !! <irc.libera.chat 93.158.239.37>.pick)
         :port(%*ENV<TESTABLE> ?? %*ENV<TESTABLE_PORT> !! 6667)
         :channels(%*ENV<DEBUGGABLE>
                   ?? $CONFIG<cave>
diff --git a/maintenance/long-term-storage.p6 b/maintenance/long-term-storage.p6
index 4dc2351..e78e30f 100755
--- a/maintenance/long-term-storage.p6
+++ b/maintenance/long-term-storage.p6
@@ -27,7 +27,7 @@ my \DIR-BASE          = PROJECT.lc;
 my \BUILDS-LOCATION   = “/tmp/whateverable/{DIR-BASE}”;
 my \ARCHIVES-LOCATION = “{WORKING-DIRECTORY}/data/builds/{DIR-BASE}”.IO.absolute;
 my \REPO-LATEST       = “/tmp/whateverable/{DIR-BASE}-repo”;
-my \CUTOFF-DATE       = PROJECT == MoarVM ?? ‘2018-10-01’ !! ‘2018-02-01’;
+my \CUTOFF-DATE       = PROJECT == MoarVM ?? ‘2020-08-20’ !! ‘2020-08-20’;
 my \TAGS-SINCE        = ‘2014-01-01’;

 my @git-latest = ‘git’, ‘--git-dir’, “{REPO-LATEST}/.git”, ‘--work-tree’, REPO-LATEST;
diff --git a/sandbox/answer b/sandbox/answer
deleted file mode 100644
index d81cc07..0000000
--- a/sandbox/answer
+++ /dev/null
@@ -1 +0,0 @@
-42
	# Copyright © 2016-2017
	# Aleks-Daniel Jakimenko-Aleksejev <alex.jakimenko@gmail.com>
	# Copyright © 2016
	# Daniel Green <ddgreen@gmail.com>
	#
	# This program is free software: you can redistribute it and/or modify
	# it under the terms of the GNU Affero General Public License as published by
	# the Free Software Foundation, either version 3 of the License, or
	# (at your option) any later version.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU Affero General Public License for more details.
	#
	# You should have received a copy of the GNU Affero General Public License
	# along with this program. If not, see <http://www.gnu.org/licenses/>.

	use File::Directory::Tree;
	use IRC::Client::Message;
	use IRC::Client;
	use IRC::TextColor;
	use JSON::Fast;
	use Number::Denominate;
	use Pastebin::Gist;
	use Terminal::ANSIColor;
	use Text::Diff::Sift4;

	use Whateverable::Bits;
	use Whateverable::Configurable;
	use Whateverable::Config;
	use Whateverable::Discordable;
	use Whateverable::Heartbeat;
	use Whateverable::Messages;
	use Whateverable::Processing;

	constant Message = IRC::Client::Message;

	unit role Whateverable does IRC::Client::Plugin;

	also does Helpful;
	also does Whateverable::Configurable;
	also does Whateverable::Discordable;

	method TWEAK {
	# wrap around everything to catch exceptions
	once { # per class
	self.^lookup(‘irc-to-me’).wrap: sub ($self, $msg) {
	return if $msg.?channel and $msg.channel ne $CONFIG<cave>
	and $msg.args[1].starts-with: ‘what:’;
	# ↑ ideally this check shouldn't be here, but it's much harder otherwise

	LEAVE sleep 0.02; # https://github.com/Raku/whateverable/issues/163
	try {
	my $result = callsame;
	return without $result;
	return $result but Reply($msg) if $result !~~ Promise;
	return start sub {
	my $awaited = try await $result;
	return handle-exception $_, $msg with $!;
	return without $awaited;
	return $awaited but Reply($msg);
	}()
	}
	handle-exception $!, $msg
	};

	self.^lookup(‘filter’).wrap: sub ($self, $response) {
	my &filter = nextcallee;
	try { return filter $self, $response }
	return ‘Ow! Where's a camcorder when ya need one?’ if $response ~~ Enough;
	try { return filter $self, handle-exception $!, $response.?msg }
	‘Sorry kid, that's not my department.’
	};
	}
	# TODO roles should not have TWEAK method
	}

	#↓ STDIN reset
	multi method irc-to-me(Message $msg where .text ~~
	#↓ Matches only one space on purpose (for whitespace-only stdin)
	/:i^ [stdin] [‘ ’\|‘=’] [clear\|delete\|reset\|unset] $/) {
	$CONFIG<stdin> = $CONFIG<default-stdin>;
	‘STDIN is reset to the default value’
	}
	#↓ STDIN set
	multi method irc-to-me(Message $msg where .text ~~ /:i^ [stdin] [‘ ’\|‘=’] $<stdin>=.* $/) {
	my $file = process-code ~$<stdin>, $msg;
	$CONFIG<stdin> = $file.slurp;
	unlink $file;
	“STDIN is set to «{shorten $CONFIG<stdin>, 200}»” # TODO is 200 a good limit
	}
	#↓ Source
	multi method irc-to-me(Message $ where .text ~~ /:i^ [source\|url] ‘?’? \s* $/) { $CONFIG<source> }
	#↓ Wiki
	multi method irc-to-me(Message $ where .text ~~ /:i^ wiki ‘?’? \s* $/) { self.get-wiki-link }
	#↓ Help
	multi method irc-to-me(Message $msg where .text ~~ /:i^ [help\|usage] ‘?’? \s* $/) {
	self.help($msg) ~ “ # See wiki for more examples: {self.get-wiki-link}”
	}
	#↓ Uptime
	multi method irc-to-me(Message $msg where .text ~~ /:i^ uptime \s* $/) {
	use nqp;
	use Telemetry;
	(denominate now - $*INIT-INSTANT) ~ ‘, ’
	~ T<max-rss>.fmt(‘%.2f’) ÷ 1024 ~ ‘MiB maxrss. ’
	~ (with (nqp::getcomp("Raku") \|\| nqp::getcomp("perl6")) {
	“This is {.implementation} version {.config<version>} ”
	~ “built on {.backend.version_string} ”
	~ “implementing {.language_name} {.language_version}.”
	})
	}
	#\| You're welcome!
	sub you're-welcome is export {
	«
	‘You're welcome!’
	‘I'm happy to help!’
	‘Anytime!’
	‘It's my pleasure!’
	‘Thank you! You love me, you really love me!’
	‘\o/’
	»
	}
	#\| Replying to thanks
	multi method irc-to-me(Message $msg where .text ~~ /:i^ [‘thank you’\|‘thanks’] \s* /) {
	you're-welcome.pick
	}
	#\| Replying to thanks
	multi method irc-privmsg-channel($msg where .text ~~ /:i [‘thank you’\|‘thanks’] .* $($msg.server.current-nick) /) {
	you're-welcome.pick
	}
	#↓ Notices
	multi method irc-notice-me( $ --> Nil) {} # Issue #321
	#↓ Private messages
	method private-messages-allowed() { False }
	multi method irc-privmsg-me($ where not $.private-messages-allowed) { # TODO issue #16
	‘Sorry, it is too private here. You can join #whateverable channel instead’
	}
	#↓ Fallback
	multi method irc-to-me($) {
	‘I cannot recognize this command. See wiki for some examples: ’ ~ self.get-wiki-link
	}
	#↓ Notify watchdog on any event
	multi method irc-all($) {
	# TODO https://github.com/zoffixznet/perl6-IRC-Client/issues/50
	I'm-alive;
	$.NEXT
	}

	method get-wiki-link { $CONFIG<wiki> ~ self.^name }

	#↓ Gistable output
	multi method filter($response where
	(.encode.elems > $CONFIG<message-limit>
	or (!~$_ and # non-empty are not gisted unless huge
	(?.?additional-files or $_ ~~ ProperStr)))) {
	# Here $response is a Str with a lot of stuff mixed in (possibly)
	my $description = ‘Whateverable’;
	my $text = colorstrip $response.?long-str // ~$response;
	my %files;
	%files<result> = $text if $text;
	%files.push: $_ with $response.?additional-files;

	if $response ~~ Reply {
	$description = $response.msg.server.current-nick;
	%files<query> = $_ with $response.?msg.?text;
	%files<query>:delete unless %files<query>;
	}
	my $url = upload %files, public => !%*ENV<DEBUGGABLE>, :$description;
	$url = $response.link-msg()($url) if $response ~~ PrettyLink;
	$url
	}

	#↓ Regular response (not a gist)
	multi method filter($text is copy) {
	ansi-to-irc($text)
	.trans([“\r\n”] => [‘␍␤’])
	.trans:
	“\n” => ‘␤’,
	3.chr => 3.chr, 0xF.chr => 0xF.chr, # keep these for IRC colors
	\|((^32)».chr Z=> (0x2400..).map(.chr)), # convert all unreadable ASCII crap
	127.chr => ‘␡’, /<:Cc>/ => ‘␦’
	}

	#↓ Gists %files and returns a link
	sub upload(%files is copy, :$description = ‘’, Bool :$public = True) is export {
	if %*ENV<TESTABLE> {
	my $gists-path = %*ENV<TESTABLE_GISTS>;
	rmtree $gists-path if $gists-path.IO ~~ :d;
	mkdir $gists-path;
	spurt “$gists-path/{.key}”, .value for %files;
	return ‘https://whatever.able/fakeupload’;
	}

	%files = %files.pairs.map: { .key => %( ‘content’ => .value ) }; # github format

	my $gist = Pastebin::Gist.new(token => $CONFIG<github><access_token> \|\| Nil);
	return $gist.paste: %files, desc => $description, public => $public
	}

	#↓ Sets things up and starts an IRC client
	method selfrun($nick is copy, @alias?) {
	ensure-config;

	use Whateverable::Builds;
	ensure-cloned-repos;

	sleep rand × $CONFIG<join-delay> if none %*ENV<DEBUGGABLE TESTABLE>;

	$nick ~= ‘test’ if %*ENV<DEBUGGABLE>;
	.run with IRC::Client.new(
	:$nick
	:userreal($nick.tc)
	:username($nick.substr(0, 3) ~ ‘-able’)
	:password(?%*ENV<TESTABLE> ?? ‘’ !! $CONFIG<irc><login password>.join: ‘:’)
	:@alias
	# IPv4 address of chat.freenode.net is hardcoded so that we can double the limit ↓
	:host(%*ENV<TESTABLE> ?? ‘127.0.0.1’ !! <irc.libera.chat 93.158.239.37>.pick)
	:port(%ENV<TESTABLE> ?? %ENV<TESTABLE_PORT> !! 6667)
	:channels(%*ENV<DEBUGGABLE>
	?? $CONFIG<cave>
	!! %*ENV<TESTABLE>
	?? “#whateverable_$nick”
	!! (\|$CONFIG<channels>, $CONFIG<cave>) )
	:debug(?%*ENV<DEBUGGABLE>)
	:plugins(self)
	:filters( -> \|c { self.filter(\|c) } )
	)
	}

	# vim: expandtab shiftwidth=4 ft=perl6
	diff --git a/lib/Whateverable.pm6 b/lib/Whateverable.pm6
	index 1dd7d80..e61451a 100644
	--- a/lib/Whateverable.pm6
	+++ b/lib/Whateverable.pm6
	@@ -215,7 +215,7 @@ method selfrun($nick is copy, @alias?) {
	:password(?%*ENV<TESTABLE> ?? ‘’ !! $CONFIG<irc><login password>.join: ‘:’)
	:@alias
	# IPv4 address of chat.freenode.net is hardcoded so that we can double the limit ↓
	- :host(%*ENV<TESTABLE> ?? ‘127.0.0.1’ !! <chat.freenode.net 195.154.200.232>.pick)
	+ :host(%*ENV<TESTABLE> ?? ‘127.0.0.1’ !! <irc.libera.chat 93.158.239.37>.pick)
	:port(%ENV<TESTABLE> ?? %ENV<TESTABLE_PORT> !! 6667)
	:channels(%*ENV<DEBUGGABLE>
	?? $CONFIG<cave>
	diff --git a/maintenance/long-term-storage.p6 b/maintenance/long-term-storage.p6
	index 4dc2351..e78e30f 100755
	--- a/maintenance/long-term-storage.p6
	+++ b/maintenance/long-term-storage.p6
	@@ -27,7 +27,7 @@ my \DIR-BASE = PROJECT.lc;
	my \BUILDS-LOCATION = “/tmp/whateverable/{DIR-BASE}”;
	my \ARCHIVES-LOCATION = “{WORKING-DIRECTORY}/data/builds/{DIR-BASE}”.IO.absolute;
	my \REPO-LATEST = “/tmp/whateverable/{DIR-BASE}-repo”;
	-my \CUTOFF-DATE = PROJECT == MoarVM ?? ‘2018-10-01’ !! ‘2018-02-01’;
	+my \CUTOFF-DATE = PROJECT == MoarVM ?? ‘2020-08-20’ !! ‘2020-08-20’;
	my \TAGS-SINCE = ‘2014-01-01’;

	my @git-latest = ‘git’, ‘--git-dir’, “{REPO-LATEST}/.git”, ‘--work-tree’, REPO-LATEST;
	diff --git a/sandbox/answer b/sandbox/answer
	deleted file mode 100644
	index d81cc07..0000000
	--- a/sandbox/answer
	+++ /dev/null
	@@ -1 +0,0 @@
	-42