P-E-P

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@dylngg Once you get confirmation from your employer, feel free to ping me and add a message in this PR stating that you've read and understand how DCO works. I'll...

> Hi, I recently encountered this issue and reached the same opinion that walk and visit should be separated. [#3115 (comment)](https://github.com/Rust-GCC/gccrs/pull/3115#discussion_r1747104532) > > > multiple question remains (some AST visitors...

For now we should probably focus on the initial goal of this PR: provide a default visitor, we'll then be able to move it to some walk funcitons in another...

I kinda dislike the idea of batch disabling warning but I fail to find any counter argument. It wouldn't trigger any warning on some rarely modified common files right ?

> > It wouldn't trigger any warning on some rarely modified common files right ? > > What do you mean? Grepping rust will trigger only warning on rust-XXX.{cc,h} files...

Well fine you convinced me, @powerboat9 could you bump the compiler version to gcc 15 ?

`derive-default` & `derive-eq-invalid` : similar to https://github.com/Rust-GCC/gccrs/pull/3766, we're duplicating a node but keeping it's node id. This means there are two different usages with one node id.

Is this a follow up to #2796 ?

https://godbolt.org/z/861EThjbr Looks like we reject it because it is not an inner attribute.