mostly reverting to the ones the interpreter was printing ; for the case of
divisions, we choose to point to the denominator instead of the operator as it's
where the only possible error (division by zero) comes from.
- Clearly distinguish Exceptions from Errors. The only catchable exception
available in our AST is `EmptyError`, so the corresponding nodes are made less
generic, and a node `FatalError` is added
- Runtime errors are defined as a specific type in the OCaml runtime, with a
carrier exception and printing functions. These are used throughout, and
consistently by the interpreter. They always carry a position, that can be
converted to be printed with the fancy compiler location printer, or in a
simpler way from the backends.
- All operators that might be subject to an error take a position as argument,
in order to print an informative message without relying on backtraces from
the backend
- This adds a `catala depends` command that recursively tracks module dependency.
It can then be used by Clerk for linking.
- Generation of cmo object files are added for OCaml (we only built native
objects, but jsoo requires bytecode).
- Some fixes to the generation of value embed/deembed shims (related to types
coming from different modules ; add support for options ; etc.)
Print to json directly rather than depend on yojson and a ppx.
Note: this should be tested with the website in order to validate that the Json
output is 1-to-1.
(a second step could be to simplify this output, now that it's manual)
