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LL| |#![feature(coverage_attribute)]
LL| |// edition: 2021
LL| |
LL| |// If the span extractor can't find any relevant spans for a function, the
LL| |// refinement loop will terminate with nothing in its `prev` slot. If the
LL| |// subsequent code tries to unwrap `prev`, it will panic.
LL| |//
LL| |// This scenario became more likely after #118525 started discarding spans that
LL| |// can't be un-expanded back to within the function body.
LL| |//
LL| |// Regression test for "invalid attempt to unwrap a None some_prev", as seen
LL| |// in issues such as #118643 and #118662.
LL| |
LL| |#[coverage(off)]
LL| |fn main() {
LL| | affected_function()();
LL| |}
LL| |
LL| |macro_rules! macro_that_defines_a_function {
LL| | (fn $name:ident () $body:tt) => {
LL| | fn $name () -> impl Fn() $body
LL| | }
LL| |}
LL| |
LL| |macro_that_defines_a_function! {
LL| | fn affected_function() {
LL| 1| || ()
LL| | }
LL| |}
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