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The bug was triggered by a particular usage of the `?` try operator in a proc-macro expansion. Thanks to lqd for the minimization. Co-authored-by: Rémy Rakic <remy.rakic+github@gmail.com>
32 lines
744 B
Rust
32 lines
744 B
Rust
//@ edition: 2024
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// (The proc-macro crate doesn't need to be instrumented.)
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//@ compile-flags: -Cinstrument-coverage=off
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use proc_macro::TokenStream;
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/// Minimized form of `#[derive(arbitrary::Arbitrary)]` that still triggers
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/// the original bug.
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const CODE: &str = "
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impl Arbitrary for MyEnum {
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fn try_size_hint() -> Option<usize> {
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Some(0)?;
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None
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}
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}
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";
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#[proc_macro_attribute]
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pub fn attr(_attr: TokenStream, _item: TokenStream) -> TokenStream {
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CODE.parse().unwrap()
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}
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#[proc_macro]
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pub fn bang(_item: TokenStream) -> TokenStream {
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CODE.parse().unwrap()
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}
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#[proc_macro_derive(Arbitrary)]
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pub fn derive_arbitrary(_item: TokenStream) -> TokenStream {
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CODE.parse().unwrap()
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}
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