Struct AbortIfUnwinding 

struct AbortIfUnwinding;

Guard that aborts the process if dropped while a panic is in progress.

Used by drop_catching_panic to implement panic-safe destructor calls without catch_unwind. When f() completes normally, the guard is dropped with std::thread::panicking() == false and becomes a no-op. If f() panics, the guard’s destructor runs during stack unwinding (when std::thread::panicking() == true) and calls process::abort().

This approach avoids catch_unwind, which registers LLVM unwind landing pads. Inside R’s GC finalizer walk, any interaction with the unwinding machinery — especially on the first call that lazily initialises exception handling state — can trigger an allocator call that re-enters R’s GC and produces a “recursive gc invocation” hard crash.

Trait Implementations

impl Drop for AbortIfUnwinding

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

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