Function assign 

pub fn assign(place: Expr, value: Expr) -> Statement

place = value;, in the form the mapping in force can write.

Under JavaMapping::Omg this is the assignment. Under JavaMapping::Psm a place made by accessor is the setter call and a place made by sequence_slot is Sequences.put; every other place (a local, an element of an array, the field of a map entry) is assigned as before.