Use expect (#9883)
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@ -66,11 +66,7 @@ impl<S : fmt::Display> Stack<S> for VecStack<S> {
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}
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fn pop_back(&mut self) -> S {
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let val = self.stack.pop();
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match val {
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Some(x) => x,
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None => panic!("Tried to pop from empty stack.")
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}
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self.stack.pop().expect("instruction validation prevents from popping too many items; qed")
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}
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fn pop_n(&mut self, no_of_elems: usize) -> &[S] {
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