Method exec

core/tests/testutils/callables/out_any_value_optional_cmd.rs:56–64

(&self, scope: Scope<'_>)

    }

    fn exec(&self, scope: Scope<'_>) -> CallResult<()> {
        let (formatted, _present, sep) = format_vararg(&scope, 0);
        assert_eq!(ArgSep::End, sep, "Command only expects one argument");

        let mut output = self.output.borrow_mut();
        output.push_str(&formatted);
        output.push('\n');
        Ok(())
    }
}