Function map_apply 

pub fn map_apply<M: Map>(a: &mut M, b: &dyn PartialReflect)

Applies the elements of reflected map b to the corresponding elements of map a.

If a key from b does not exist in a, the value is cloned and inserted. If a key from a does not exist in b, the value is removed.

Panics

This function panics if b is not a reflected map.