[plt-scheme] PLT Scheme v4.0

From: Michael Vanier (mvanier at cs.caltech.edu)
Date: Thu Jun 12 04:31:29 EDT 2008

Never mind.  I found the problem: my old .plt-scheme directory was lying around, and when I deleted
it everything worked correctly.


Michael Vanier wrote:
> Hmm.  I just compiled and installed PLT Scheme 4.0 from source on my Linux box.  Then I tried to go
> through the tutorial at
> http://docs.plt-scheme.org/quick/
> and it failed when I tried to run the
> #lang slideshow
> line (I'd already switched into the module language).  The error message was:
> standard-module-name-resolver: collection not found: #<path:slideshow/lang> in any of: ()
> Any idea what's going on?
> Mike
> Eli Barzilay wrote:
>> PLT Scheme version 4.0 is now available from
>>      http://plt-scheme.org/
>> This major new release offers many improvements over version 372, and
>> we encourage everyone to upgrade.
>>   * The PLT Scheme language now provides better syntax for modules,
>>     better support for optional and keyword arguments to functions, a
>>     more complete syntax for structure types, new syntax for list
>>     comprehensions and iterations, a more complete and consistent set
>>     of list operations, a more complete set of string operations, and
>>     streamlined hash-table operations.
>>   * The documentation has been re-organized and re-written.  New
>>     tutorials and overviews offer a clearer introduction to Scheme and
>>     PLT Scheme.
>>   * New documentation tools help programmers create and install
>>     documentation for libraries and Planet packages.  All installed
>>     documentation can be read though the user's web browser, and even
>>     searching within the browser works on local files.
>>     The language for writing documentation is an extension of Scheme,
>>     and document sources are linked to implementations through the
>>     module system.  The module connection allows, for example,
>>     reliable automatic hyperlinking of identifiers mentioned in
>>     documentation to their specifications in other documentation.
>>   * R6RS programs are supported in two ways: though the `plt-r6rs'
>>     executable and through the `#!r6rs' prefix.  The latter allows an
>>     R6RS library or program to serve as a PLT Scheme module.
>>   * Legacy R5RS support is improved, partly through a separate
>>     `plt-r5rs' executable.
>>   * Pairs are immutable within the PLT Scheme language; mutable pairs
>>     (which are the same as R6RS and R5RS pairs) are provided as a
>>     separate datatype.  For more information, see
>>       http://blog.plt-scheme.org/2007/11/getting-rid-of-set-car-and-set-cdr.html
>>   * ProfessorJ uses a new and improved parser, it evaluates programs
>>     faster, and it includes a Java-specific indenter.
>>   * Testing frameworks for the HtDP and HtDC (ProfessorJ) teaching
>>     languages have been unified.  Both support systematic unit testing
>>     in a comprehensive fashion.  When programs lack tests, students
>>     are asked to add test cases.  When all tests succeed, a simple
>>     message says so; otherwise, a pop-up window (dockable) displays
>>     URLs to the failed test cases and explains why the cases failed.
>>   * Typed Scheme, a statically typed dialect of Scheme, is now
>>     included with PLT Scheme.  While Typed Scheme is still in its
>>     early stages of development, it supports modular programming with
>>     types and full interaction with existing untyped code.  Safe
>>     interactions between typed and untyped modules are enforced via
>>     contracts.  Typed Scheme also features a novel type system
>>     designed to accommodate Scheme programming idioms.  For more
>>     information, see http://www.ccs.neu.edu/~samth/typed-scheme/ .
>> Feedback Welcome,
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