+= does work for variables, even Strings.
AFAIR, there already has been a discussion about += and friends for
properties.
In fact I don't see why the compiler not just generates "x.a := x.a + y"
from "x.a += y" before doing any code generating, disregarding what x.a
is. Of course an error message will occur if x.a is not writable for any
reason.
Thanks,
-Michael
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