cannot modify struct with immutable members

[ketmar via Digitalmars-d-learn]

On Sat, 03 Jan 2015 14:45:24 +1030
ted via Digitalmars-d-learn <digitalmars-d-learn at puremagic.com> wrote:

p.s. also please note that structs in D are always passed by value and
copied (until you not explicitly ask for something another). so:

  MyStruct a;
  MyStruct b;
  b = a;

actually does `memcpy()` (with postblit if there is any). and it's
forbidden to overwrite `const` variable contents. that's why compiler
complains: by assigning to `mA` you are trying to overwrite contents of
`const` variable.
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