Method parse

crates/cli-flags/src/opt.rs:338–343

(val: Option<&str>)

impl WasmtimeOptionValue for String {
    const VAL_HELP: &'static str = "=val";
    fn parse(val: Option<&str>) -> Result<Self> {
        match val {
            Some(val) => Ok(val.to_string()),
            None => bail!("value must be specified with `key=val` syntax"),
        }
    }

    fn display(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(self)