Looking at the [actual list of targets supported](https://github.com/rust-lang/rust/tree/master/src/librustc_target/spec) it is fairly clear that the list is not exhaustive. Notable examples: armv4, riscv32...
Looking at the actual list of targets supported it is fairly clear that the list is not exhaustive.
Notable examples: armv4, riscv32...