Function vstd::map_lib::lemma_union_remove_left

source · 
pub broadcast proof fn lemma_union_remove_left<K, V>(m1: Map<K, V>, m2: Map<K, V>, k: K)
Expand description
requires
m1.contains_key(k),
!m2.contains_key(k),
ensures
#[trigger] m1.union_prefer_right(m2).remove(k) == m1.remove(k).union_prefer_right(m2),