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