Raku 6.e support

prefix //Full

Shorthand for .defined; in 6.d, // opens an empty regex.

say //42, " ", //Any;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

term nanoFull

The POSIX time in nanoseconds, as an Int, next to time and now.

say nano ~~ Int;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

q:o / q:format literalsFull

A compile-time sprintf template that is a callable Format object. Needs Rakudo's RakuAST frontend as well as 6.e.

my $f := q:o/%5s/; say $f.^name; say $f("foo");

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

Rakudo needs its RakuAST frontend for this one (RAKUDO_RAKUAST=1); Raku++ does not.

the RakuAST:: packageNot implemented

Available without a pragma from 6.e; under 6.d it needs use experimental :rakuast.

say RakuAST::IntLiteral.new(42).DEPARSE;

slipped multislice @a[||@i]Full

A list of indices spliced into a multi-dimensional subscript.

my @a = [[1,2],[3,4]],; my @i = 0,1,0; say @a[||@i];

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

hash hyperslice %h{**}Full

Every leaf of a nested associative, at any depth.

my %h = A => { B => 1, C => 2 }, D => 3; say %h{**}:k.sort.join(",");

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

hash multislice %h<a;b>Full

One value, not a one-element list as in 6.d.

my %h = A => { B => 42 }; say %h{'A';'B'};

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

unit sub foo;Full

The semicolon form, for any sub rather than only MAIN — but it must be unit-scoped. Nothing prints: the rest of the file is the sub's body.

unit sub foo;
say "compiled";

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

rotor as a subFull

The cycle comes first, the list last.

say rotor(2, 1..6); say rotor(2, 1, 1..6);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

snip as a subFull

Split a list where a predicate stops holding.

say snip(* < 3, 1,2,3,4);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

snitch as a subFull

Note a value in passing and return it unchanged — a print(1) that does not disturb the expression.

my $x = snitch("hi"); say $x;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

trans as a subFull

For use in feed operators.

say trans("a" => "b", "banana");

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

comb with a PairFull

size => step, the way rotor takes it.

say comb(2 => 1, "abcdef");

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

next with a valueFull

The value becomes the result of that iteration.

say (1,2,3).map({ $_ == 2 ?? next(42) !! $_ }).List;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

last with a valueFull

Same, and it is the final element produced.

say (1,2,3).map({ $_ == 2 ?? last(99) !! $_ }).List;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

.snipFull

On Any and on Supply.

say (1,2,3,4,5).snip(* < 3);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

.snitchFull

Notes to $*ERR by default; takes a snitcher of your own.

my $x = (1,2).snitch; say $x.List;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

.skip with a listFull

Alternates produce N, skip N — .skip(2,3) keeps the first two and drops the next three.

say (1..10).skip(2,3).List;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

.nomarkFull

The string with every mark stripped from its graphemes.

say "élan vitál".nomark;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

IO::Path.stemFull

The basename without extensions — all of them, or the last N.

say "foo.tar.gz".IO.stem, " ", "foo.tar.gz".IO.stem(1);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

Complex.signFull

v / |v| — the unit complex number. In 6.d, .sign throws on a non-real.

say (3+4i).sign;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

Int.roll / Int.pickFull

42.pick(3) is short for (^42).pick(3).

say 6.roll ~~ Int, " ", 6.pick(3).elems;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

Mu.Callable($name)Full

The method of that name, or a Failure — a findable method reference.

say 42.Callable("Str") ~~ Method;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

Str.comb with a PairFull

The method form of the same size => step combing.

say "abcdef".comb(2 => 1);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

:smartcase on the Str searchesFull

Case-insensitive unless the needle itself has a capital. On contains, starts-with, ends-with, index, indices, rindex, substr-eq.

say "Hello World".contains("world", :smartcase), " ", "Hello World".contains("World", :smartcase);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

.fmt with a FormatFull

Added to Bag, BagHash, List, Map, Mix, MixHash, Pair, Seq, Set and SetHash.

say (1,2,3).fmt(q:o/%3d/);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

Rakudo needs its RakuAST frontend for this one (RAKUDO_RAKUAST=1); Raku++ does not.

Date.DateTime(:timezone)Full

The named argument is honoured; in 6.d it is silently dropped.

say Date.new(2026,1,1).DateTime(:timezone(3600)).timezone;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

Instant.DateTime(:timezone)Full

The same fix on Instant.

say Instant.from-posix(0).DateTime(:timezone(3600)).timezone;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

sqrt of a negative IntFull

A Complex rather than NaN.

say (-4).sqrt;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

sqrt of a negative NumFull

The same fix on the floating-point side.

say (-4e0).sqrt;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

log of a negative NumFull

The complex logarithm rather than NaN.

say (-1e0).log;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

Range.BoolFull

Emptiness, not "has endpoints".

say so (5..1), " ", so ("b".."a");

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

string ranges iterate by .succFull

6.d walks a per-position cross product, which is why ("az".."bc") has 52 elements there.

say ("az".."bc").join(",");

Raku++ does this without the pragma too — under 6.d, where Rakudo still does the old thing.

sprintf: sign before the prefixFull

C puts the minus first for every base.

say sprintf("%#x", -256);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

sprintf: + and space no longer apply to %bFull

A binary conversion has no sign to decorate.

say sprintf("[%+b][% b]", 5, 5);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

sprintf: # on a floatFull

Forces the decimal point, as in C.

say sprintf("[%#.0f]", 1);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

sprintf: %G upper-cases NaNFull

And only %G — %g keeps the Raku spelling.

say sprintf("[%G][%g]", NaN, NaN);

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

a role's submethods are not composedFull

BUILD, TWEAK and DESTROY still run — 6.e adds them to the buildplan explicitly — but a role submethod is no longer callable as a method on the class.

role R { submethod s { 42 } }; class C does R { }; say C.new.s;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

a package no longer replaces its namesakeFull

class A::B inside module A::B nests instead of silently overwriting the outer stash.

module A::B { class A::B { } }; say A::B::A::B.^name;

Raku++ does this without the pragma too — under 6.d, where Rakudo still does the old thing.

shaped hashes default to MuFull

The value type of my %h{Str} with no explicit type.

my %h{Str}; say %h<nope>.WHAT.^name;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

@_ is per-blockFull

Every block gets its own implicit *@_ instead of reaching for the enclosing routine's.

sub f(*@_) { my &c = { @_.elems }; say c(1,2,3) }; f(7,7,7,7);

Raku++ does this without the pragma too — under 6.d, where Rakudo still does the old thing.

pseudo-packages fail on a missing symbolFull

A Failure instead of Nil, so the mistake is not silent.

my $r = MY::<$nosuchvar>; say $r.^name;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

LEXICAL:: rejects a dynamicFull

A $*variable is not a lexical, and asking for one through LEXICAL:: now says so.

my $*dyn = 42; sub f { say LEXICAL::<$*dyn> }; f;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

Grammar.parse fails instead of returning NilFull

6.e gives grammars a new base class whose failed parse carries an X::Syntax::Confused with the position.

grammar G { token TOP { \d+ } }; my $r = G.parse("abc"); say $r.^name;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

splice can insert an itemized array wholeFull

A $[…] argument goes in as one element rather than being flattened.

my @a = 1,2,3; @a.splice(1,1,$[8,9]); say @a.raku;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

a subset records its language versionFull

Even.^ver reports the revision it was declared under.

subset Even of Int where * %% 2; say Even.^ver;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

unknown regex boundaryFull

Only <|w> and <|c> are boundaries; anything else was a silent no-op.

say so "abc" ~~ /<|f> abc/;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

experimental macrosFull

Not carried into 6.e.

use experimental :macros; macro m() { quasi { 42 } }; say m();

Both refuse the program, but Raku++ has no macros under any revision, so what it reports is a parse error rather than the 6.e diagnostic.

sub foo; without unitFull

6.d rejects the semicolon form for anything but MAIN; 6.e allows any sub, but demands unit scope.

sub foo;
say "compiled";

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

.pm is no longer a module extensionFull

CompUnit::Repository::FileSystem looks for .rakumod and .pm6 only.

use OldMod; hi;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.

single-path unlink / rmdir / chmod / chownFull

One path in, one Bool out; the multi-path forms still work but are deprecated.

say unlink("/tmp/no-such-file-abc123").raku;

Raku++ gates this on the pragma: without use v6.e.PREVIEW it does the 6.d thing.