Course:CPSC311/2010WT1/Assignment 1 Gotchas

Assignment #1 Gotchas for Everyone

• Don't kill yourself giving lovely errors on malformed input on this assignment. It's not required.
• The IDE (DrRacket) does not automatically save your code when ran. Save manually (and often, as the debugger likes to crash).

Assignment #1 Gotchas for New Racketeers

• Focus on the guide (http://docs.racket-lang.org/guide/) to learn new elements of Racket and the general docs (http://docs.racket-lang.org/) for reference
• Don't forget to put #lang plai at the top of your file (or have it added automatically)

PLAI/Racket Gotchas for Experienced Schemers

• () is not the empty list in Racket. Use '() or empty instead.

Other Stuff

• You can access the fields of a type with a type-case expression, but for small accesses (like the Binding type), try either writing your own reusable access method that uses type-case or the built-in accessors based on the type constructor names, not the type's names, like: binding-name (lowercase like the type constructor, not uppercase like the type) and binop-lhs (though you'll probably want type-case for that one).