Almost two decades predating it, and sadly no OS vendor picked up on it.

Many people forget C++ is a C sibling, born at AT&T on the same building UNIX and C were being handled, thus it was quite an easy win for C compiler vendors, to add C++ support to their toolchains.

Note that Objective-C also never made it outside NeXT, GNUStep was never that good clone, and had it not been for Apple's acquision and success, maybe we would no longer speak about it.

When Facebook or Remedy Games played with D, we hoped it would somehow improve adoption, that was never the case, and both companies no longer use D.