it's now done explicitely from the driver, which allows to do it before typing
and is more consistent; the information was already forwarded to the later
compilation stages separately from the program AST anyway.
Note that this is incomplete in the case of desugared/scopelang because we only
have typing for expressions yet, and the scope/program structure is different.
The code allows passing an environment of types for scope/subscope variables in
order to resolve `ELocation` terms, but that's unused until we implement
scopelang typing at the scope level.
This moves dcalc/typing.ml to shared_ast, and generalises the input type, but
without yet implementing the extra cases (these are all `assert false`): it's
just a first step.
Note that there were significant differences between the two printers (see the test diff!). Overall the `dcalc` one seemed newer so that's what I took, with only the required additions from `lcalc` (exceptions, raise and catch)
Handling code should now be reasonably well sorted between `Shared_ast.{Var,Expr,Scope,Program}`
The function parameters (e.g. `make_let_in`) could be removed from the
scope handling functions since now the types are compatible, which
makes them much easier to read.
It's not expected to stay that way forever, but some additional effort will be required for them to preserve (or restore) types; until then, be safe and don't forward possibly incorrect information.
Should make it much easier and less error-prone to add new options. There is
still a bit of boiler-plate, but at least it's contained in the Cli.options
function and doesn't transpire in the interfaces.
This avoids many intermediate calls to e.g. `Format.asprintf`; should result in
some cases in "more correct" use of `Format`¹, avoid the computation of unused
debug strings, and make the code more readable.
¹ for `Format` to work as expected, all intermediate calls need to go through
it. Some cases of formatting to an intermediate string then printing through Format
again are still present, but this makes the situation better.
