1 error: recursion limit reached while expanding the macro `prob1`
2 --> $DIR/issue-16098.rs:17:18
4 LL | $n + prob1!($n - 1); //~ ERROR recursion limit reached while expanding the macro `prob1`
7 LL | println!("Problem 1: {}", prob1!(1000));
8 | ------------ in this macro invocation
10 = help: consider adding a `#![recursion_limit="128"]` attribute to your crate
12 error: aborting due to previous error