Duet is an educational dialect of Haskell aimed at interactivity. This is a demonstration page of the work-in-progress structured editor. The previous upload was duet-delta. Currently, you can write value declarations in it. Only integer numbers are supported in the editor presently; you can't write strings and there are no data types available.
The previous demonstration release demonstrated the type-checker and evaluator.
Presently, compilation messages are displayed above as you type. I will be making these part of the structured editor.