From 716ce6aa5bfbbbc6ca9f840c9e724fa2f08b21a2 Mon Sep 17 00:00:00 2001
From: Rahix <rahix@rahix.de>
Date: Sat, 4 May 2024 22:54:02 +0200
Subject: [PATCH] examples: Pin proc-macro2 dependency

See <https://github.com/Rahix/avr-hal/issues/537> for details.
---
 examples/atmega328p/Cargo.toml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/examples/atmega328p/Cargo.toml b/examples/atmega328p/Cargo.toml
index b9a532e..c7f20d1 100644
--- a/examples/atmega328p/Cargo.toml
+++ b/examples/atmega328p/Cargo.toml
@@ -24,6 +24,12 @@ version = "0.5.3"
 # path = "../.."
 features = ["atmega328p", "rt"]
 
+# The latest releases of `proc-macro2` do not support the rust toolchain that
+# we use.  Thus, we must fix this dependency to an older version where our
+# toolchain is still supported.  See https://github.com/Rahix/avr-hal/issues/537
+[build-dependencies.proc-macro2]
+version = "=1.0.79"
+
 # Configure the build for minimal size - AVRs have very little program memory
 [profile.dev]
 panic = "abort"