tests/ui/consts/min_const_fn/promotion.rs

   1 use std::cell::Cell;
   2
   3 const fn foo1() {}
   4 const fn foo2(x: i32) -> i32 { x }
   5 const fn foo3() -> i32 { 42 }
   6 const fn foo4() -> Cell<i32> { Cell::new(42) }
   7 const fn foo5() -> Option<Cell<i32>> { Some(Cell::new(42)) }
   8 const fn foo6() -> Option<Cell<i32>> { None }
   9
  10 fn main() {
  11     let x: &'static () = &foo1(); //~ ERROR temporary value dropped while borrowed
  12     let y: &'static i32 = &foo2(42); //~ ERROR temporary value dropped while borrowed
  13     let z: &'static i32 = &foo3(); //~ ERROR temporary value dropped while borrowed
  14     let a: &'static Cell<i32> = &foo4();  //~ ERROR temporary value dropped while borrowed
  15     let a: &'static Option<Cell<i32>> = &foo5(); //~ ERROR temporary value dropped while borrowed
  16     let a: &'static Option<Cell<i32>> = &foo6(); //~ ERROR temporary value dropped while borrowed
  17 }