I appreciate that restrict isn't there, because it is yet another UB source, programmer knows not to do errors kind of attitude, and secondly no one seems to care enough to write a language proposal for it.
I take it you probably never tried to use any of these languages for HPC. Without a language standard, you have two options there to compile decently performant executables: (1) compiler pragmas, (2) give up and drop to assembly code.
I should add here that there's also (3): Switch to Fortran, which made fundamentally different choices and is IMO the only fully supported higher-than-C level language that can produce HPC applications without fighting a compiler left and right.
I take it you probably never tried to use any of these languages for HPC. Without a language standard, you have two options there to compile decently performant executables: (1) compiler pragmas, (2) give up and drop to assembly code.
I should add here that there's also (3): Switch to Fortran, which made fundamentally different choices and is IMO the only fully supported higher-than-C level language that can produce HPC applications without fighting a compiler left and right.