expect_fun_call suggests code that does not compile

[RalfJung]

I have this piece of code

            let config_table = rocket.config().get_table(section)
                .expect(format!("[{}] table in Rocket.toml missing or not a table", section).as_str());

which clippy recommends I change to

            let config_table = rocket.config().get_table(section)
                .unwrap_or_else(|_| panic!(format!("[{}] table in Rocket.toml missing or not a table", section).as_str()));

Unfortunately, that does not compile:

error[E0597]: borrowed value does not live long enough
  --> src/config.rs:88:44
   |
88 |                 .unwrap_or_else(|_| panic!(format!("[{}] table in Rocket.toml missing or not a table", section).as_str()));
   |                                     -------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^----------
   |                                     |      |
   |                                     |      temporary value does not live long enough
   |                                     temporary value only lives until here
   |
   = note: borrowed value must be valid for the static lifetime...
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

[ghost]

I'm looking at this.

[phansch]

Probably the same as #2928