Struct TierGuard 

pub struct TierGuard { /* private fields */ }

RAII guard — pushes a tier onto the current-thread stack on construction, pops on drop. Lets lifecycle prologues enforce tier ordering across .await points without nesting the rest of the body inside a with_tier closure. Debug builds carry the ordering check; release builds compile to a zero-sized no-op.

Field/declaration-order note: callers must declare the guard before the permit/hold it is scoping. Rust drops locals in reverse declaration order, so _tier declared first drops last — after the lock/permit releases — matching with_tier semantics.

Implementations

impl TierGuard

pub fn push(tier: Tier) -> Self

Push tier onto the current-thread tier stack. Debug builds assert strictly-increasing order against the existing top.

Trait Implementations

impl Drop for TierGuard

Available on debug-assertions enabled only.

fn drop(&mut self)

Executes the destructor for this type.