This library lets you write dependent partial functions in monadic style to be able to prove things about all terminating outputs, including proving which inputs are terminating, but also execute them and extract them.
The development is found in the theories folder.
PartialFun.v contains the definition of the library while Examples.v
contains some examples (integer division and untyped λ-calculus for now).
This is very early-stage for now but it should work with Coq 8.16 and the corresponding Equations version.