From ac3e4e476f67411177e73e80f0e932aaba5a6593 Mon Sep 17 00:00:00 2001
From: Tamir Duberstein <tamird@gmail.com>
Date: Sun, 8 Apr 2018 18:25:41 -0400
Subject: Avoid new validation in proc-macro2

Evidently, we run afoul of this.
---
 Cargo.toml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index a9f2bdc6..c15674c9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -53,7 +53,9 @@ peeking_take_while = "0.1.2"
 quote = { version = "0.5", default-features = false }
 regex = "0.2"
 which = "1.0.2"
-proc-macro2 = { version = "0.3.2", default-features = false }
+# New validation in 0.3.6 breaks bindgen-integration:
+# https://github.com/alexcrichton/proc-macro2/commit/489c642.
+proc-macro2 = { version = "0.3.2, < 0.3.6", default-features = false }
 
 [dependencies.env_logger]
 optional = true
-- 
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