[Issue 9133] std.datetime: Cannot implicitly convert const(SysTime) to SysTime

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9133


Jonathan M Davis <jmdavisProg at gmx.com> changed:

           What    |Removed                     |Added
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                 CC|                            |jmdavisProg at gmx.com
          Component|Phobos                      |DMD


--- Comment #1 from Jonathan M Davis <jmdavisProg at gmx.com> 2012-12-10 02:09:16 PST ---
It's an issue with dmd. For whatever reason, it won't let you assign a SysTime
to const or immutable even though everything in it should be convertible to
const. The fact that it contains reference to a class screws it up, even though
it's immutable. You have to have a postblit to fix it, but you can't have a
const or immutable postblit, so you can't copy it if it's const or immutable.
This problem occurs with every single struct which has reference types in it
aside from dynamic arrays. It's something that needs to be solved in the
language and the compiler. So, it comes down to two things:

1. dmd should be smart enough to realize that it doesn't need a postblit
constructor in this case (because the class is immutable), but it isn't.

2. postblit is inherently broken with regards to const and immutable. This is a
huge problem that goes way beyond just std.datetime.

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