Maxime Jacquemin authored 2 years ago and David Bühler committed 2 years ago

The only remaining mention to <Db.From> is in <eva/register.ml>.
It looks like a circular dependency, but maybe we could tackle it later.

- easier to instantiate
- locs can now be changed each time a block is opened (needed by Variadic)

supports pattern such as

```c
enum {
     TAG1 = 42,
     TAG2 = TAG1 << 3
};
```

In presence of the following pattern of code:

```c
struct S;
enum { t = 1 };
struct S { char[t]; };
```

-ast-diff will attempt to compare the use of `t` in the field declaration
before having visited the `enum` definition. Thus, we can't rely on an enumitem
being present in the correspondance table when looking for a correspondance.

Uses a reference to a function provided by Eva to compute the dependency
of a term.

and update is_null_expr and is_non_null_expr in a similar manner as the other ones

The name seems to imply that it will return Some for any constant integer expression,
not only for integer literals

[as_location] converts error cases in bottom or top location accordingly.
Adds the value [loc_top] to Locations.

These files were previously in src/plugins/value_types, and very briefly
in src/kernel_externals/value_types.