Function on_end_async_named_scope_dyn 

pub fn on_end_async_named_scope_dyn(
    span_id: u64,
    parent_span_id: u64,
    span_location: &'static SpanLocation,
    name: &str,
    depth: u32,
)

Like on_end_async_named_scope, for a name built at runtime. The name is written again to the block that is current now, which may differ from the block of the begin event and from the thread it ran on.