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