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.

Virgile Prevosto authored 3 years ago and David Bühler committed 2 years ago

same issue as with compinfo

Virgile Prevosto authored 3 years ago and David Bühler committed 2 years ago

it turns out that not all global varinfos are stored in Globals.Vars...

Virgile Prevosto authored 3 years ago and David Bühler committed 2 years ago

same reason as for locals: latter formals can refer to former ones

Virgile Prevosto authored 3 years ago and David Bühler committed 2 years ago

a local can be referenced in the type of another one, hence we can't
compare them in the same environment and update said environment
afterwards.

Virgile Prevosto authored 3 years ago and David Bühler committed 2 years ago

actually, we visit the spec of a function at its first occurrence,
so that it is possible that some global logic definitions
that are used in the constract haven't been visited yet.

Virgile Prevosto authored 3 years ago and David Bühler committed 2 years ago

Specifically if a global declaration `x` occurs between a
function declaration `f` and the definition of `f` which uses `x`

Virgile Prevosto authored 3 years ago and David Bühler committed 2 years ago

also working oracle for AST diff test