p6rt
commented
7 years ago From @lizmat
Actually reported as a SO question by brian d foy:
\
Open p6rt opened 7 years ago
p6rt
commented
7 years ago Actually reported as a SO question by brian d foy:
\
p6rt
commented
6 years ago my @h [] @h.splice: 0, 0, 1.Seq [] @h[0].VAR.WHAT (Int) @h[0] = 5 Cannot modify an immutable Int (1) in block \
at \ line 1
I got hit by this with: @a.splice: 0, 0, Any xx 2
perl6 -v This is Rakudo version 2017.07 built on MoarVM version 2017.07 implementing Perl 6.c. perl6 -V distro::auth=Apple Computer, Inc. distro::desc=2017-09-09T09:21:56.148447+08:00 distro::is-win=False distro::name=macosx distro::path-sep=: distro::release=16G29 distro::signature= distro::version=10.12.6 kernel::arch=i386 kernel::archname=x86_64-darwin kernel::auth=unknown kernel::bits=64 kernel::desc= kernel::hardware=x86_64 kernel::name=darwin kernel::release=Darwin Kernel Version 16.7.0: Thu Jun 15 17:36:27 PDT 2017; root:xnu-3789.70.16~2/RELEASE_X86_64 kernel::signature= kernel::version=16.7.0 moar::ar=ar moar::arflags=rcs moar::arout= moar::asm=.s moar::asmout=-o moar::asmswitch=-S moar::auxclean=@: moar::be=0 moar::bindir=/Applications/Rakudo/bin moar::booltype=_Bool moar::can_unaligned_int32=1 moar::can_unaligned_int64=1 moar::can_unaligned_num64=1 moar::cancgoto=1 moar::canrdtscp=1 moar::cat=cat moar::cc=clang moar::cc_covflags=-fprofile-instr-generate -fcoverage-mapping 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p6rt
commented
6 years ago On Fri, 08 Sep 2017 18:37:50 -0700, tomentiruran@gmail.com wrote:
my @h [] @h.splice: 0, 0, 1.Seq [] @h[0].VAR.WHAT (Int) @h[0] = 5 Cannot modify an immutable Int (1) in block \
at \ line 1 I got hit by this with: @a.splice: 0, 0, Any xx 2
Good find.
It's also not specific to `Seq` - it looks like it happens whenever the replacement elements are passed to `splice` as a nested structure rather than as flat arguments:
my @h; @h.splice: 0, 0, 'a'; @h.splice: 1, 0, ('b',);
dd @h; # Array @h = ["a", "b"] say @h[0].VAR.^name; # Scalar say @h[1].VAR.^name; # Str
Conceptually¹⁺², the `splice` routine takes the replacements as a `*@` slurpy, so whether they're passed in nested or flat form should not matter.
But Rakudo currently implements the routine with a `| is raw` signature:
say Array.^find_method("splice").signature; # (Mu $: | is raw)
...and apparently does the parameter flattening manually, in a way that introduces this bug.
Until it is fixed, a work-around is to flatten the replacement elements into the argument list of `splice` using `|`:
@a.splice: 0, 0, |(Any xx 2);
[1] https://docs.perl6.org/routine/splice [2] https://design.perl6.org/S32/Containers.html#splice
p6rt
commented
6 years ago The RT System itself - Status changed from 'new' to 'open'
p6rt
commented
6 years ago On Sun, 16 Apr 2017 12:56:58 -0700, elizabeth wrote:
Actually reported as a SO question by brian d foy:
http://stackoverflow.com/questions/43437664/how-can-i-get-around-a- slurpy-parameter-in-the-perl-6-signature
\
m: my @a = [1,1],[2,2],[3,3]; dd @a; @a.splice: 0, 2, $[4,4]; dd @a # feels like a bug that the containerization of [4,4] is being ignored \<+camelia> rakudo-moar 188711: OUTPUT: «Array @a = [[1, 1], [2, 2], [3, 3]]Array @a = [4, 4, [3, 3]]» \ lizmat: Yeah, it's because there's a candidate with @new at the end that it binds to, decontainerizing it in the process. \ So it's not actually hitting the slurpy at all \ so you agree it's wrong atm \ The slurpy is **@foo \ So in fact if it *was* hitting the slurpy it would be behaving right :) \ Yeah, it's wrong to discard the itemization \ ok, so we are in agreement \ I wonder if it was untested and then accidentally regressed when splice was optimized by breaking it out into a bunch of candidates \ will file a rakudobug \ Since I seem to recall splice getting at least something of a look during the GLR \ And I can't imagine we settled on "it ignores itemization" :) \ bisectable6: my @a = [1,1],[2,2],[3,3]; @a.splice: 0, 2, $[4,4]; dd @a \<+bisectable6> jnthn, On both starting points (old=2015.12 new=1887114) the exit code is 0 and the output is identical as well \<+bisectable6> jnthn, Output on both points: «Array @a = [4, 4, [3, 3]]» \ Hm, nope \ It's been like that since Christmas \ ok, doesn't make it right, though :-) \ Indeed \ but will wait for the release to look at fixing it \ *nod*
This ticket and RT#132047 may be merged.
Please find an experimental tree at: https://github.com/skids/rakudo/tree/rt131162
commit 998738620d1ca327e1b2d7727b7a0f28b9bce542 Author: skids \bri@​abrij\.org Date: Fri Sep 15 21:01:48 2017 -0400
GLR-ize splice's @replacement argument
Collapse **@ and @ candidates into +@ candidates. This is a spec/doc change. Will need to be reconciled. May need to figure out how to make this 6.d-only (or later) Amazingly, passes all spectests. Fixes RT#131162 and RT#132047 Needs ecosystem-wide testing for fallout
(I also tried **@ and it did not fair very well. There are many specttests that assume single-argument-rule behavior on single arguments.)
splice's prototype never got touched during GLR, if you look at git blame in specs. It just got missed, I guess. Probably not the only one.
If someone who is tooled to do an ecosystem-wide/multiplatform test could try this tree we could get an idea how disruptive it would be.
Figuring out where this sits WRT 6.d, both feature-wise and technically as to how we best replace 6.c's Array candidates or dispatcher.
No performance tests have been done on this. I notice we still keep some core code doing +@ by hand but don't know if that is due to performance or just because they were implemented before we had that slurpy modifier, or due to a needed behavioral quirk.
p6rt
commented
6 years ago The RT System itself - Status changed from 'new' to 'open'
Migrated from rt.perl.org#131162 (status was 'open')
Searchable as RT131162$