1 error: recursion limit reached while expanding `prob1!`
2 --> $DIR/issue-16098.rs:7:18
4 LL | $n + prob1!($n - 1);
7 LL | println!("Problem 1: {}", prob1!(1000));
8 | ------------ in this macro invocation
10 = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`issue_16098`)
11 = note: this error originates in the macro `prob1` (in Nightly builds, run with -Z macro-backtrace for more info)
13 error: aborting due to previous error