diff --git a/src/test/ui/derive-uninhabited-enum-38885.rs b/src/test/ui/derive-uninhabited-enum-38885.rs new file mode 100644 index 0000000000000..dc7f5d60cd82c --- /dev/null +++ b/src/test/ui/derive-uninhabited-enum-38885.rs @@ -0,0 +1,27 @@ +// Copyright 2018 The Rust Project Developers. See the COPYRIGHT +// file at the top-level directory of this distribution and at +// http://rust-lang.org/COPYRIGHT. +// +// Licensed under the Apache License, Version 2.0 or the MIT license +// , at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +// compile-pass +// compile-flags: -Wunused + +// ensure there are no special warnings about uninhabited types +// when deriving Debug on an empty enum + +#[derive(Debug)] +enum Void {} //~ WARN never used + +#[derive(Debug)] +enum Foo { //~ WARN never used + Bar(u8), + Void(Void), +} + +fn main() {} + diff --git a/src/test/ui/derive-uninhabited-enum-38885.stderr b/src/test/ui/derive-uninhabited-enum-38885.stderr new file mode 100644 index 0000000000000..11032abfa12ae --- /dev/null +++ b/src/test/ui/derive-uninhabited-enum-38885.stderr @@ -0,0 +1,14 @@ +warning: enum is never used: `Void` + --> $DIR/derive-uninhabited-enum-38885.rs:18:1 + | +LL | enum Void {} //~ WARN never used + | ^^^^^^^^^ + | + = note: `-W dead-code` implied by `-W unused` + +warning: enum is never used: `Foo` + --> $DIR/derive-uninhabited-enum-38885.rs:21:1 + | +LL | enum Foo { //~ WARN never used + | ^^^^^^^^ +