Comment by kibwen

I'm not intending to imply that the language I'm describing can't support heap-allocated memory; Rust shows us that it's even possible to do so without having to manually deallocate, if you're okay with a single-ownership discipline (which is a rather simple analysis to implement, as long as you don't also want a borrow checker along for the ride). Instead, this is about trying to make a language that makes it easy to keep locals in registers/cache, rather than relying on the compiler backed to do register allocation and hoping that your CPU can handle all that cache you're thrashing.