Release of version 0.4 of the ULTRA type error slicer for SML
rahli vincent <[email protected]> Fri, 13 Nov 2009 19:27:00 +0000
| Newsgroups | gmane.comp.lang.sml.smlnj |
|---|---|
| Message-ID | <[email protected]> |
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We are happy to announce the release of the version 0.4 of our type
error slicing software for the SML programming language.
Major improvements over the previous release:
* Overloaded operators can now be specified.
* Special comments can now inform the type error slicer about
identifiers in the top-level environment with their
types/signatures. (This allows handling things like "use" and
"CM.autoload" and working around the fact that we do not yet
support "open".)
* We provide a larger basis including more of the standard SML basis
and some SML/NJ-specific declarations.
* We fixed many cases where the Emacs interface failed silently.
Other less important changes/improvements are:
* We improved the error slices for record clashes.
* We improved the pretty printing of error slices.
* We improved the highlighting of white spaces.
* We improved our error slice minimisation algorithm.
* We improved the communication between our type error slicer and
its Emacs interface.
* We provide new error messages on status clashes (for example
between an exception constructor and a datatype constructor).
* Our test case database is much bigger, so there are fewer problems
in general.
* And we solved many bugs.
Even more changes are documented in the ChangeLog file.
The aim of our type error slicer is to provide useful type error
reports for pieces of code written in SML:
* It identifies all of the program points that contribute to a type
error, including the spot with the actual programming error that
caused the type error.
* It highlights these program points in the original, unchanged
source code.
* It avoids showing internal details of the operation of the type
inference machinery.
A new compiled package of our type error slicer can be found at this URL:
http://www2.macs.hw.ac.uk/~rahli/cgi-bin/slicer/downloads.html
Known limitations:
* We have not yet built the software for other operating systems
than Linux.
* The only currently supported user interface is via GNU Emacs (or
our web demo).
* Some features of the SML language are not parsed (the user will be
notified if this is the case), and some type errors are not yet
discovered (the user will need to rely on their usual type checker
in these cases). Notable spots where the implementation is
incomplete are functors (you can work around this by including
signatures on functor applications), equality types, and fixity
declarations.
* We don't yet handle overloaded constants (for example 1 is always
of type int).
* The details of the SML basis library are incomplete (fortunately
the user can add any additional details they are using).
* The software does not currently scale well to very large programs
(we are still improving this). It is currently suitable for small
programs and use in teaching.
* We have some known issues with context dependencies on long
identifiers which yields wrong error reports.
Best wishes,
Vincent Rahli and Joe Wells
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We are happy to announce the release of the version 0.4 of our type<br>erro=
r slicing software for the SML programming language.<br><br>Major improveme=
nts over the previous release:<br>=A0 * Overloaded operators can now be spe=
cified.<br>
=A0 * Special comments can now inform the type error slicer about<br>=A0=A0=
=A0 identifiers in the top-level environment with their<br>=A0=A0=A0 types/=
signatures.=A0 (This allows handling things like "use" and<br>=A0=
=A0=A0 "CM.autoload" and working around the fact that we do not y=
et<br>
=A0=A0=A0 support "open".)<br>=A0 * We provide a larger basis inc=
luding more of the standard SML basis<br>=A0=A0=A0 and some SML/NJ-specific=
declarations.<br>=A0 * We fixed many cases where the Emacs interface faile=
d silently.<br>
<br>Other less important changes/improvements are:<br>=A0 * We improved the=
error slices for record clashes.<br>=A0 * We improved the pretty printing =
of error slices.<br>=A0 * We improved the highlighting of white spaces.<br>=
=A0 * We improved our error slice minimisation algorithm.<br>
=A0 * We improved the communication between our type error slicer and<br>=
=A0=A0=A0 its Emacs interface.<br>=A0 * We provide new error messages on st=
atus clashes (for example<br>=A0=A0=A0 between an exception constructor and=
a datatype constructor).<br>
=A0 * Our test case database is much bigger, so there are fewer problems<br=
>=A0=A0=A0 in general.<br>=A0 * And we solved many bugs.<br><br>Even more c=
hanges are documented in the ChangeLog file.<br><br>The aim of our type err=
or slicer is to provide useful type error<br>
reports for pieces of code written in SML:<br>=A0 * It identifies all of th=
e program points that contribute to a type<br>=A0=A0=A0 error, including th=
e spot with the actual programming error that<br>=A0=A0=A0 caused the type =
error.<br>
=A0 * It highlights these program points in the original, unchanged<br>=A0=
=A0=A0 source code.<br>=A0 * It avoids showing internal details of the oper=
ation of the type<br>=A0=A0=A0 inference machinery.<br><br>A new compiled p=
ackage of our type error slicer can be found at this URL:<br>
<br>=A0 <a href=3D"http://www2.macs.hw.ac.uk/~rahli/cgi-bin/slicer/download=
s.html">http://www2.macs.hw.ac.uk/~rahli/cgi-bin/slicer/downloads.html</a><=
br><br>Known limitations:<br>=A0 * We have not yet built the software for o=
ther operating systems<br>
=A0=A0=A0 than Linux.<br>=A0 * The only currently supported user interface =
is via GNU Emacs (or<br>=A0=A0=A0 our web demo).<br>=A0 * Some features of =
the SML language are not parsed (the user will be<br>=A0=A0=A0 notified if =
this is the case), and some type errors are not yet<br>
=A0=A0=A0 discovered (the user will need to rely on their usual type checke=
r<br>=A0=A0=A0 in these cases).=A0 Notable spots where the implementation i=
s<br>=A0=A0=A0 incomplete are functors (you can work around this by includi=
ng<br>=A0=A0=A0 signatures on functor applications), equality types, and fi=
xity<br>
=A0=A0=A0 declarations.<br>=A0 * We don't yet handle overloaded constan=
ts (for example 1 is always<br>=A0=A0=A0 of type int).<br>=A0 * The details=
of the SML basis library are incomplete (fortunately<br>=A0=A0=A0 the user=
can add any additional details they are using).<br>
=A0 * The software does not currently scale well to very large programs<br>=
=A0=A0=A0 (we are still improving this).=A0 It is currently suitable for sm=
all<br>=A0=A0=A0 programs and use in teaching.<br>=A0 * We have some known =
issues with context dependencies on long<br>
=A0=A0=A0 identifiers which yields wrong error reports.<br><br>Best wishes,=
<br><br>Vincent Rahli and Joe Wells<br>
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