From b8dbdbb2059bdc7761fd9a8a2a1cba71079edcc7 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sat, 2 Oct 2021 01:49:51 -0400
Subject: [PATCH] Declare minimum Rust version in Cargo metadata

---
 Cargo.toml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Cargo.toml b/Cargo.toml
index 543dca52..84d31f2b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,7 @@ repository = "https://github.com/alexcrichton/proc-macro2"
 documentation = "https://docs.rs/proc-macro2"
 categories = ["development-tools::procedural-macro-helpers"]
 edition = "2018"
+rust-version = "1.31"
 description = """
 A substitute implementation of the compiler's `proc_macro` API to decouple
 token-based libraries from the procedural macro use case.