Creating an anonymous struct in the machdep causes an indexing shift for
user-created anonymous structures.

When tests are run in parallel, using the same name for two test outputs might
truncate it before it is written, leading to a non-deterministic oracle.

For now we ignore "unused" label attribute, because the current mecanism
does not support different attributes with the same name : "unused" can
be a label attribute or a function attribute.

Loc will be updated once we encounter the definition

When using an enum in a ternary operator, the value is const-folded
before checking if it evaluates to `true` or `false` so that const-expr
used as enum values are supported.