src/test/ui/regions/region-object-lifetime-in-coercion.rs

   1 // Test that attempts to implicitly coerce a value into an
   2 // object respect the lifetime bound on the object type.
   3
   4 trait Foo {}
   5 impl<'a> Foo for &'a [u8] {}
   6
   7 fn a(v: &[u8]) -> Box<dyn Foo + 'static> {
   8     let x: Box<dyn Foo + 'static> = Box::new(v);
   9     //~^ ERROR lifetime may not live long enough
  10     x
  11 }
  12
  13 fn b(v: &[u8]) -> Box<dyn Foo + 'static> {
  14     Box::new(v)
  15     //~^ ERROR lifetime may not live long enough
  16 }
  17
  18 fn c(v: &[u8]) -> Box<dyn Foo> {
  19     // same as previous case due to RFC 599
  20
  21     Box::new(v)
  22     //~^ ERROR lifetime may not live long enough
  23 }
  24
  25 fn d<'a,'b>(v: &'a [u8]) -> Box<dyn Foo+'b> {
  26     Box::new(v)
  27     //~^ ERROR lifetime may not live long enough
  28 }
  29
  30 fn e<'a:'b,'b>(v: &'a [u8]) -> Box<dyn Foo+'b> {
  31     Box::new(v) // OK, thanks to 'a:'b
  32 }
  33
  34 fn main() { }