File: issue-3668.rs

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struct P { child: Option<Box<P>> }
trait PTrait {
   fn getChildOption(&self) -> Option<Box<P>>;
}

impl PTrait for P {
   fn getChildOption(&self) -> Option<Box<P>> {
       static childVal: Box<P> = self.child.get();
       //~^ ERROR attempt to use a non-constant value in a constant
       panic!();
   }
}

fn main() {}