pub fn assign_mapping<T: Into<Stored>>(map: &str, key: &str, value: Option<T>)Expand description
Bind key to value inside the named mapping — Perl’s AssignMapping.
A mapping is a named hash living in the value table (TAG_PROPERTIES,
counter_for_type, …). The mapping itself is created globally on first
use, so that entries assigned inside a group are still found from outside
it; passing None for value removes the key. Read entries back with
with_mapping.