Walter Bright: >that I doubt exist in a back end designed for C/C++.<
But note this has the disadvantage of making less easy to adapt a backend (like LLVM) to D. This may reduce or slow down the diffusion of D to other compilers and platforms. So every one of such special feature backend has to chosen with care. In the near term most people may chose LLVM as the most used backend for the D language, so if LLVM isn't able to support some of those features (but exceptions are too much basic, they will be necessary), such features will become virtually absent from D programs you can see around and in the end from D language itself. Bye, bearophile
