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Diffstat (limited to 'tests/coverage/no_spans.coverage')
| -rw-r--r-- | tests/coverage/no_spans.coverage | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tests/coverage/no_spans.coverage b/tests/coverage/no_spans.coverage new file mode 100644 index 00000000000..e55177698a2 --- /dev/null +++ b/tests/coverage/no_spans.coverage @@ -0,0 +1,30 @@ + 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| |} + |