Engine: name clash for items within trait methods

[W95Psp]

In the folllwing snippet, the items A_STRUCT and a_fn yields name clashes.

struct A;
struct B;

impl Clone for A {
   fn clone(&self) -> Self {
      struct A_STRUCT;
      fn a_fn(){};
      A
   }
}
impl Clone for B {
   fn clone(&self) -> Self {
      struct A_STRUCT;
      fn a_fn(){};
      B
   }
}

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