pub fn report(solution: &Solution, only: Option<&str>) -> Result<String, String>Expand description
beck explain place — §4.7’s derivation, not its conclusion.
A String rather than a print, because there are two front doors onto this answer: the command
line, and the playground, where “source on the left, what the compiler derives on the right”
is the whole of rung A (docs/17 §17.1). Two renderers
would be two things to keep true.
With a name, one decision and its candidates; without one, the whole table.