[Issue 20424] A constructor with a value argument of the same type as being constructed should be an error

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20424

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
An object with a copy constructor cannot be blitted into place. (Such is not
allowed in C++, either, and such constructors are rejected by the compiler.)

There is no advantage to doing it anyway over passing by ref.

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