Università di Torino

Rank 2 Intersection Types for (a subset of) Caml

This page demonstrates a prototype implementation of a rank 2 intersection type system for higher order functional languages. The current version of the prototype (1.0), released (as Unlicensed Free Software -- http://unlicense.org/) in December, 2010:

  • Implements the type system described in [ Damiani, 2003 ].
  • Is based on an earlier prototype (carried on as part of the Master Thesis [ Leporati, 2000 ]) for a preliminary version of the type system (presented in [ Damiani, 2000 ]) - thanks to Sebastien Carlier for pointing out some bugs in earlier versions of the prototype.
  • Is written in O'Caml .
  • Accepts as input a subset of (O')Caml itself - the language considered by the implementation is richer than the one considered in the report [ Damiani, 2003 ] (in particular it includes top-level definitions and datatype declarations).

Type a program in the form below and press the button.

  • Parsing is not particularly smart. For instance, all the infix operators have the same precedence. To avoid problems, it is better to use a lot of parentheses.

Here you can find a description of the accepted SYNTAX and some EXAMPLES that you can copy and paste.

Souce files are available: files.zip

This is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means. In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. For more information, please refer to http://unlicense.org/

[On-line tools demonstrations]

Comments to: damiani[at]di[dot]unito[dot]it Last update: Feb 14, 2011