From d96bfa25f1d9695e624e7ae393b55ac2ccd6735a Mon Sep 17 00:00:00 2001
From: Nathan Regner <nathanregner@users.noreply.github.com>
Date: Thu, 17 Jun 2021 18:51:07 -0600
Subject: [PATCH] Fix README doctests on latest nightly (#175) (#176)

doc(include) was removed in https://github.com/rust-lang/rust/pull/85457.
Tests should now run on on both nightly and stable.
---
 elasticsearch/src/lib.rs | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/elasticsearch/src/lib.rs b/elasticsearch/src/lib.rs
index bde412a4..4900fded 100644
--- a/elasticsearch/src/lib.rs
+++ b/elasticsearch/src/lib.rs
@@ -347,11 +347,19 @@
 // TODO: turn on before releasing :) Will require adding documentation within all REST API specs
 // #![deny(missing_docs)]
 
-// also test examples in README when using rust nightly.
-// required as external_doc feature requires nightly
-#![cfg_attr(RUSTC_IS_NIGHTLY, feature(external_doc))]
-#[cfg_attr(RUSTC_IS_NIGHTLY, doc(include = "../../README.md"), cfg(doctest))]
-type _DoctestReadme = ();
+// also test examples in README
+// source: https://github.com/rust-lang/cargo/issues/383#issuecomment-720873790
+#[cfg(doctest)]
+mod readme {
+    macro_rules! external_doc_test {
+        ($x:expr) => {
+            #[doc = $x]
+            extern "C" {}
+        };
+    }
+
+    external_doc_test!(include_str!("../../README.md"));
+}
 
 #[macro_use]
 extern crate dyn_clone;