pub fn suggest(candidates: &[&str], input: &str) -> Option<String>Expand description
“Did you mean” suggestion over a fixed candidate list: returns the
first candidate within edit distance 2 of input, if any. The
flag-level equivalent is folded into unknown_long_error; this
public entry is for the enum-dispatch codegen, which suggests a
subcommand name when the user mistypes one (bin trian → train).