Engine: name clash with nested mod and fns

[W95Psp]

mod a {
    mod b {
        fn c() {
            
        }
    }
}
fn a() {
    mod b {
        fn c() {
            
        }
    }
}

Open this code snippet in the playground

[github-actions]

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[franziskuskiefer]

@maximebuyse will investigate when #1199 is merged.

[W95Psp]

Fixed by #1199