This Week in Perl 6, August 2-9, 2005
by Matt Fowles
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Pages: 1, 2, 3
MinGW Meets m4
François Perrad provided two patches to make m4 work on MinGW. Warnock applies.
substr
Segfault
Will Coleda posted a short PIR test that will segfault in the
substr opcode. This led to some discussion of variable-width
encodings. Leo explained that substr was a call that would
probably force Parrot to rectify variable-width encodings into fixed-width ones
(which it does lazily). Then he fixed it (presumably as he had suggested).
Parrot Cygwin Meets Treefrog
Steve "treefrog" posted a patch he needed to get Cygwin testing. I think he may have posted it to Google Groups directly, though. Warnock applies.
Call Opcode Cleanups
Leo attempted to free himself from the horns of Warnock by reposting his suggested call opcode cleanup. Patrick and I voiced our support. More accurately, I voiced support and Patrick indifference.
Perl 6 Language
Complex Control Flow
Nigel Hamilton began speculating that Perl 6 might have an extremely complicated control flow. Then he began to wonder aloud about a form of control flow I can only describe as brain-melting. Luke Palmer suggested that his proposal might best start as a module.
Slurpy Parameters and Flattening
Ingo Blechschmidt's question of the flattening (or not) of slurpy params continued producing some suggestions. Piers seemed somewhat unhappy with earlier answers, but the thread died out.
Does
if Topicalize?
Luke Palmer noticed if foo() -> $foo { ... } in an OSCON
talk and wondered if if now topicalized. Stuart Cook offered a
workaround.
Data Constructors
Luke Palmer posted his thoughts on unifying units and data constructors (as in Haskell or ML). Warnock applies.
Calling
Methods on undef
Ingo Blechschmidt wondered what would happen if he called
undef.chars or char undef. Brent "Dax" Royal-Gordon
responded that it would return undef in the absence of use fatal.
Larry confirmed this behavior.
Reassigning
.ref and .meta
Ingo Blechschmidt wondered what would happen if he assigned to
.ref or .meta. Luke Palmer figured that it would not
be allowed. I think it should cause a large person to come over to your house
and kick you. This is probably a good reason I don't write error messages.
Questioning
.ref and .meta
Ingo Blechschmidt left a bunch of blanks for people to fill in with respect
to .ref and .meta. Luke Palmer apparently segfaulted
in the attempt to fill in the blanks.
Subscripting Pairs
Ingo Blechschmidt wondered if one could subscript pairs. Larry declared no.
Perl 6 Test in Parrot 0.2.3
Andrew Shitov was having trouble running Perl 6 under the latest Parrot. Autrijus pointed out that he was trying to run the compiler attempt abandoned in June of 2004 and then pointed him toward Pugs.
Java -> Perl ?
Tim Bunce wondered if any work had started on parsing Java interface definitions and translating them to Perl 6. Warnock applies (which probably means no).
MetaObject Questions
Stevan Little posted some of his thoughts on the MetaObject internals for comment. Many questions ensued, my eyes glazed over, the summarizer punted.
defined
and typed Traits
Autrijus mused about how to deal with defined and typed traits in Perl 6.
This led Larry to wonder about undef being a class, or a class being undef, or
something confusing.
is
constant Sugar
Autrijus wondered how is constant would desugar if it were a
special form. Larry came up with suggestions, some of which said it desugared
and some of which said it didn't.
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