mirror of https://github.com/rust-lang/rust
39 lines
990 B
Rust
39 lines
990 B
Rust
// Because drop recursion can only be detected after drop elaboration which
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// happens for codegen:
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//@ build-fail
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#![deny(unconditional_recursion)]
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#![allow(dead_code)]
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pub struct RecursiveDrop;
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impl Drop for RecursiveDrop {
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fn drop(&mut self) { //~ ERROR function cannot return without recursing
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let _ = RecursiveDrop;
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}
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}
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#[derive(Default)]
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struct NotRecursiveDrop1;
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impl Drop for NotRecursiveDrop1 {
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fn drop(&mut self) {
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// Before drop elaboration, the MIR can look like a recursive drop will
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// occur. But it will not, since forget() prevents drop() from running.
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let taken = std::mem::take(self);
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std::mem::forget(taken);
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}
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}
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struct NotRecursiveDrop2;
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impl Drop for NotRecursiveDrop2 {
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fn drop(&mut self) {
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// Before drop elaboration, the MIR can look like a recursive drop will
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// occur. But it will not, since this will panic.
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std::panic::panic_any(NotRecursiveDrop2);
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}
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}
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fn main() {}
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