Wrong compiler error description

[nkbai]

I tried this code:

 struct A {}
struct Msg<'a> {
    s: &'a [i32],
}
impl A {
    async fn g(buf: &[i32]) -> Msg<'_> {
        Msg { s: &buf[0..1] }
    }
    async fn f() {
        let mut buf = [0; 512];
        let m2 = &buf[..];
        let m = Self::g(m2).await;
        Self::f2(m).await;
    }
    async fn f2(m: Msg /*<'_>*/) {}
}

I expected to report error on function f2 only,

error[E0726]: implicit elided lifetime not allowed here
  --> src/lib.rs:15:20
   |
15 |     async fn f2(m: Msg /*<'_>*/) {}
   |                    ^^^- help: indicate the anonymous lifetime: `<'_>`

Instead, it has error following:

  Compiling playground v0.0.1 (/playground)
error[E0726]: implicit elided lifetime not allowed here
  --> src/lib.rs:15:20
   |
15 |     async fn f2(m: Msg /*<'_>*/) {}
   |                    ^^^- help: indicate the anonymous lifetime: `<'_>`

warning: variable does not need to be mutable
  --> src/lib.rs:10:13
   |
10 |         let mut buf = [0; 512];
   |             ----^^^
   |             |
   |             help: remove this `mut`
   |
   = note: `#[warn(unused_mut)]` on by default

error[E0597]: `buf` does not live long enough
  --> src/lib.rs:11:19
   |
11 |         let m2 = &buf[..];
   |                   ^^^
   |                   |
   |                   borrowed value does not live long enough
   |                   cast requires that `buf` is borrowed for `'static`
...
14 |     }
   |     - `buf` dropped here while still borrowed

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0597`.
error: could not compile `playground`.

To learn more, run the command again with --verbose.

there should be no error E0597.

you can test on playground

Meta

rustc --version --verbose:

rustc 1.43.0-nightly (0176a9eef 2020-02-17)
binary: rustc
commit-hash: 0176a9eef845e7421b7e2f7ef015333a41a7c027
commit-date: 2020-02-17
host: x86_64-apple-darwin
release: 1.43.0-nightly
LLVM version: 9.0

[nkbai]

error description is right on stable and beta version.

[Dylan-DPC]

The code now returns the expected error instead of the reported one.