get_vec and the borrow checker play badly together

[wbl]

get_vec returns Vec<&str>. Unfortunately the borrow checker interprets this to make the first argument to get_vec also have static scope, ala https://stackoverflow.com/questions/58436950/argument-requires-that-is-borrowed-for-static-how-do-i-work-round-this.

There do not seem to be any good workarounds other than changing the type of the function.

[wbl]

Apparently it's possible to tickle the borrow checker into inferring the correct type here without explicit lifetimes.