This project works to formalize the proof obligation checking of Stainless. It is a natural follow-up to the System FR from https://arxiv.org/abs/1904.03482.
Run sbt cli/universal:stage to get a binary in folder cli/target/universal/stage/bin.
Then, after making a symbolic link or referring to the binary directly, you can type-check an example using:
fit typecheck --html examples/typechecker/stream.sf
This will create an HTML file of the type-checking derivation in examples/typechecker/stream.sf.html.
Syntax coloring mode is not yet available. If you are using emacs, you can try to use tuareg-mode for approximate syntax coloring.