From 38d99a7f8cbc1cceb06eab8378348a988561c84e Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Thu, 4 Mar 2021 17:47:01 -0800
Subject: [PATCH] Touch up assertion messages from PR 970

---
 src/punctuated.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/punctuated.rs b/src/punctuated.rs
index 299548c68c..f94edc2915 100644
--- a/src/punctuated.rs
+++ b/src/punctuated.rs
@@ -164,7 +164,7 @@ impl<T, P> Punctuated<T, P> {
     pub fn push_value(&mut self, value: T) {
         assert!(
             self.empty_or_trailing(),
-            "Punctuated::push_value: Punctuated is not empty or does not have a trailing punctuation",
+            "Punctuated::push_value: cannot push value if Punctuated is missing trailing punctuation",
         );
 
         self.last = Some(Box::new(value));
@@ -180,8 +180,9 @@ impl<T, P> Punctuated<T, P> {
     pub fn push_punct(&mut self, punctuation: P) {
         assert!(
             self.last.is_some(),
-            "Punctuated::push_punct: Punctuated doesn't have any items",
+            "Punctuated::push_punct: cannot push punctuation if Punctuated is empty or already has trailing punctuation",
         );
+
         let last = self.last.take().unwrap();
         self.inner.push((*last, punctuation));
     }