| #![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() { |
| || () |
| } |
| } |
