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- Current State of Exceptions in Rakudo and Perl 6
- Meet DBIish, a Perl 6 Database Interface
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- Exceptions Grant Report for May 2012
- Exceptions Grant Report -- Final update
- Perl 6 Hackathon in Oslo: Be Prepared!
- Localization for Exception Messages
- News in the Rakudo 2012.05 release
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- Rakudo Hack: Dynamic Export Lists
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- Stop The Rewrites!
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- A small regex optimization for NQP and Rakudo
- Pattern Matching and Unpacking
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- A new Perl 6 community server - call for funding
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Sun, 03 May 2009
Rakudo's rough edges
The Rakudo developers know about these, but by shedding a light on these edges I hope that I motivate people to work on them, as well as giving fellow Rakudo users the feeling that they are not alone with their woes.
Here they are:
- Missing line numbers in error messages
- Can't initialize attributes in BUILD methods
The first one is pretty obvious: While parse errors show a line number in the error message, other compile time errors and parse errors don't. When debugging a larger application that's really a pain. I've been told that this is very close to being implemented, and maybe it is at the time I get this blog post published, so here is hope.
If you've only toyed around with Rakudo a bit, you might not have hit the
second item on my list. Perl 6 has a rather sophisticated object model, and
Rakudo implements large parts of it. But in larger applications it still feels
a bit hacky because you can't use the
BUILD submethod to set up
attributes, it dies with a
Null PMC access. Therefore one has to
revert to custom init methods, and is always in danger of forgetting to call
Performance again is very obvious: Rakudo has a startup time of nearly a second, and both execution and compilation is very slow. Thanks to module precompilation it is somewhat manageable in bigger projects, but it's still something that needs improvement. Thankfully Allison Randal is reworking the calling conventions in Parrot, and we can hope for some speedup there.
There are other things that could use some polishing, but which seem of somewhat lower priority to me:
- Syntax errors could be more specific.
- The error
say requires an argumentshould only appear for an otherwise syntactically correct statement, not if there's a syntax error later in the code - it is rather misleading in that case.
- When the user lets his program
die(), parrot's stack trace should not be shown - if a stack trace is desirable, then one showing only Perl 6 routines.
- A mechanism for controlling warnings would be very welcome.
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