From b2c478f9ccb971f350e364d16a45cdd128dca3a8 Mon Sep 17 00:00:00 2001
From: uk <50893351+unterkontrolle@users.noreply.github.com>
Date: Tue, 11 Jun 2019 11:49:48 -0300
Subject: Add rust target configuration for feature #1554

Will panic if the feature is being used outside nightly.
See https://github.com/rust-lang/rust-bindgen/pull/1575#discussion_r292231027
---
 src/codegen/mod.rs | 4 +++-
 src/features.rs    | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/codegen/mod.rs b/src/codegen/mod.rs
index aa920c9b..2863387f 100644
--- a/src/codegen/mod.rs
+++ b/src/codegen/mod.rs
@@ -2580,8 +2580,10 @@ impl CodeGenerator for Enum {
         match variation {
             EnumVariation::Rust { non_exhaustive: nh } => {
                 attrs.push(attributes::repr(repr_name));
-                if nh {
+                if nh && ctx.options().rust_features().non_exhaustive {
                     attrs.push(attributes::non_exhaustive());
+                } else if nh && !ctx.options().rust_features().non_exhaustive {
+                    panic!("The rust target you're using doesn't seem to support non_exhaustive enums");
                 }
             },
             EnumVariation::Bitfield => {
diff --git a/src/features.rs b/src/features.rs
index 05f5dc42..4dc526ec 100644
--- a/src/features.rs
+++ b/src/features.rs
@@ -206,6 +206,8 @@ rust_feature_def!(
     Nightly {
         /// `thiscall` calling convention ([Tracking issue](https://github.com/rust-lang/rust/issues/42202))
         => thiscall_abi;
+        /// `non_exhaustive` enums/structs ([Tracking issue](https://github.com/rust-lang/rust/issues/44109))
+        => non_exhaustive;
     }
 );
 
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