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The symbol was interpolated with Rust's Debug formatting, which escapes a control character into literal `\n`-style text. It is now written into the format's quoted literal directly, and a symbol holding a control character is refused along with a quote or a backslash, so nothing is escaped behind the user's back. Test: `accounting_format_takes_the_symbol_it_is_given` covers `\n` and a tab. `cargo xtask ci`: 8/8 steps, 0 failures.