Well, if we are going hardcore nothing prevents to write a Ferrocene compliant Rust compiler in Assembly.
Or even better, lets follow the hype, use bootstrap strategies from the 1960's, and use WebAssembly instead, like many bytecode based compilers on those days, having written a macro Assembler instead, thus mapping the bytecodes into macros for the specific home made CPU.
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Well, if we are going hardcore nothing prevents to write a Ferrocene compliant Rust compiler in Assembly.
Or even better, lets follow the hype, use bootstrap strategies from the 1960's, and use WebAssembly instead, like many bytecode based compilers on those days, having written a macro Assembler instead, thus mapping the bytecodes into macros for the specific home made CPU.