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digitalmars.D - Add isCopyConstructible to std.traits

I need a template constraint to ensure a struct is not copyable. 
While I found hasElaborateCopyConstructor* in std.traits, there 
seems not to be something like isCopyConstructible. Shall I 
create an enhancement request or did I miss something? Same 
question for isDefaultConstructible.

* This site and TDPL both try to make a clear distinction between 
C++'s copy constructor and D's postblit. Wouldn't 
hasElaboratePostblit be a better name?
Mar 18 2014