From: Andrew Cann <shum@canndrew.org>
Date: Sat, 30 Jul 2016 05:24:53 +0000 (+0800)
Subject: impl Debug + Display for !
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=ee78f37e2a68120119dcda4312db0be3b545eabe;p=rust.git

impl Debug + Display for !
---

diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index 173c55e35d5..60862334846 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -1363,6 +1363,29 @@ fn fmt(&self, f: &mut Formatter) -> Result { $tr::fmt(&**self, f) }
 
 fmt_refs! { Debug, Display, Octal, Binary, LowerHex, UpperHex, LowerExp, UpperExp }
 
+// Note: This macro is a temporary hack that can be remove once we are building with a compiler
+// that supports `!`
+macro_rules! argh {
+    () => {
+        #[unstable(feature = "bang_type", issue = "35121")]
+        impl Debug for ! {
+            fn fmt(&self, _: &mut Formatter) -> Result {
+                *self
+            }
+        }
+
+        #[unstable(feature = "bang_type", issue = "35121")]
+        impl Display for ! {
+            fn fmt(&self, _: &mut Formatter) -> Result {
+                *self
+            }
+        }
+    }
+}
+
+#[cfg(not(stage0))]
+argh!();
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Debug for bool {
     fn fmt(&self, f: &mut Formatter) -> Result {