File: variance-use-covariant-struct-1.rs

package info (click to toggle)
rustc-web 1.78.0%2Bdfsg1-2~deb12u3
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,245,420 kB
  • sloc: xml: 147,985; javascript: 18,022; sh: 11,083; python: 10,265; ansic: 6,172; cpp: 5,023; asm: 4,390; makefile: 4,269
file content (14 lines) | stat: -rw-r--r-- 303 bytes parent folder | download | duplicates (11) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
 
// Test that a covariant struct does not permit the lifetime of a
// reference to be enlarged.

struct SomeStruct<T>(T);

fn foo<'min,'max>(v: SomeStruct<&'min ()>)
                  -> SomeStruct<&'max ()>
    where 'max : 'min
{
    v
    //~^ ERROR lifetime may not live long enough
}

fn main() { }