Method unparse_singleton

crates/ruff_python_codegen/src/generator.rs:1379–1385

(&mut self, singleton: Singleton)

    }

    fn unparse_singleton(&mut self, singleton: Singleton) {
        match singleton {
            Singleton::None => self.p("None"),
            Singleton::True => self.p("True"),
            Singleton::False => self.p("False"),
        }
    }

    fn unparse_parameters(&mut self, parameters: &Parameters) {
        let mut first = true;