src/test/compile-fail/issue-22312.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use std::ops::Index;
  12
  13 pub trait Array2D: Index<usize> {
  14     fn rows(&self) -> usize;
  15     fn columns(&self) -> usize;
  16     fn get<'a>(&'a self, y: usize, x: usize) -> Option<&'a <Self as Index<usize>>::Output> {
  17         if y >= self.rows() || x >= self.columns() {
  18             return None;
  19         }
  20         let i = y * self.columns() + x;
  21         let indexer = &(*self as &Index<usize, Output = <Self as Index<usize>>::Output>);
  22         //~^ERROR non-scalar cast
  23         Some(indexer.index(i))
  24     }
  25 }
  26
  27 fn main() {}