Lifetime error with `#[aoc...`

[dylanmc]

I'm just getting off the ground and tripped up here, boiled down example:

use aoc_runner_derive::{aoc, aoc_generator};

#[aoc_generator(day2)]
fn input_to_lines(input: &str) -> Vec<&str> {
    input.lines().collect()
}

#[aoc(day2, part1)]
fn count_good_passwords(lines: Vec<&str>) -> usize {
    lines.len()
}

When I try to build this, I get the error:

    Checking advent-of-code-2015 v0.1.0 (/Users/dylanjames/Develop/Languages/Rust/AdventOfCode2020)
error[E0106]: missing lifetime specifier
 --> src/day2.rs:9:1
  |
9 | #[aoc(day2, part1)]
  | ^ expected named lifetime parameter
  |
  = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider introducing a named lifetime parameter
  |
9 | #<'a>[aoc(day2, part1)]<'a>
  | ^^^^^                  ^^^^

I know I'm doing something silly, but am not sure how to coerce the compiler into telling me what, exactly, I've done wrong.

[pedantic79]

Probably a dup of #20