convert between registers

rune has two syntactic registers — classic (Rust-shaped) and pure (digraph). Both parse to the same AST, so conversion is mechanical and lossless. rune fmt does it.

All commands run from rs/.

classic → pure

echo '6 * 7' > prog.rune
cargo run --bin rune -- fmt --to=rune prog.rune

(mul 6 7)

pure → classic

cargo run --bin rune -- fmt --to=rust prog.rune

6 * 7

With no --to flag, fmt defaults to the classic (rust) register.

what is preserved

Conversion never changes the AST or the lowered Nox noun — only the spelling. A program means exactly the same thing in either register; nothing forces you to move between them. See two registers, one AST for why both exist.

note on eval

rune eval parses the classic register. To evaluate pure-register source, convert it first or put it in a file for rune run.