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#![feature(coverage_attribute)]
//@ edition: 2021
// If the span extractor can't find any relevant spans for a function, the
// refinement loop will terminate with nothing in its `prev` slot. If the
// subsequent code tries to unwrap `prev`, it will panic.
//
// This scenario became more likely after #118525 started discarding spans that
// can't be un-expanded back to within the function body.
//
// Regression test for "invalid attempt to unwrap a None some_prev", as seen
// in issues such as #118643 and #118662.
#[coverage(off)]
fn main() {
affected_function()();
}
macro_rules! macro_that_defines_a_function {
(fn $name:ident () $body:tt) => {
fn $name () -> impl Fn() $body
}
}
macro_that_defines_a_function! {
fn affected_function() {
|| ()
}
}
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