Error: cannot modify struct arr[0] MyStruct with immutable members

[Adam D. Ruppe via Digitalmars-d-learn]

On Monday, 11 May 2015 at 13:37:27 UTC, ref2401 wrote:
> Why does it happen?

You'd just be writing to the immutable memory through a different 
name.

Consider if someone took a reference to one of those immutable 
ints, expecting it to never change. Then you wrote a new struct 
over the same location with different values. Then the ints 
pointed to by that reference suddenly change, despite allegedly 
being immutable!

Assigning a struct in-place is the same as assigning all its 
members.