incorrect hint for expect_fun_call

[abbychau]

example:

warning: use of `expect` followed by a function call
  --> src/main.rs:27:45
   |
27 |     dotenv::var(format!("{}_{}", ex_id, i)).expect(&format!("key {}_{} not found", ex_id, i))
   |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|_| panic!("key {}_{} not found", ex_id))`
   |
   = note: #[warn(clippy::expect_fun_call)] on by default
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#expect_fun_call

should be panic!("key {}_{} not found", ex_id,i), instead of panic!("key {}_{} not found", ex_id)

I can't reproduce this on the playground.
What version of Clippy are you using?

fn main() {
    let a = 1;
    let b = 2;
    let o = Some(true);
    o.expect(&format!("key {}, {}", a, b));
}

    Checking playground v0.0.1 (/playground)
warning: use of `expect` followed by a function call
 --> src/main.rs:5:7
  |
5 |     o.expect(&format!("key {}, {}", a, b));
  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| panic!("key {}, {}", a, b))`
  |
  = note: #[warn(clippy::expect_fun_call)] on by default
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#expect_fun_call

    Finished dev [unoptimized + debuginfo] target(s) in 1.29s

Playground

[abbychau]

❯ cargo clippy --version
clippy 0.0.212 (1b89724b 2019-01-15)

That's the current stable version. I can reproduce the bug locally with that version.
Looks like this has been fixed by #3690 but I'll add a test case to make sure.