From 9b8f8d9e961aee2beba9f27a8b8df7a547e5851c Mon Sep 17 00:00:00 2001
From: GrayJack <gr41.j4ck@gmail.com>
Date: Fri, 15 Nov 2019 22:42:23 -0300
Subject: [PATCH 1/2] Make Vec::len() a const fn

---
 src/liballoc/vec.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
index 4363314dc4580..34e8ab6169ec6 100644
--- a/src/liballoc/vec.rs
+++ b/src/liballoc/vec.rs
@@ -1311,7 +1311,7 @@ impl<T> Vec<T> {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn len(&self) -> usize {
+    pub const fn len(&self) -> usize {
         self.len
     }
 

From 88cd4fc674b93f15ea54aff159eba1a869f92f5e Mon Sep 17 00:00:00 2001
From: GrayJack <gr41.j4ck@gmail.com>
Date: Fri, 15 Nov 2019 22:44:59 -0300
Subject: [PATCH 2/2] Make Vec::is_empty() a const fn

---
 src/liballoc/vec.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
index 34e8ab6169ec6..78b9cac625772 100644
--- a/src/liballoc/vec.rs
+++ b/src/liballoc/vec.rs
@@ -1327,7 +1327,7 @@ impl<T> Vec<T> {
     /// assert!(!v.is_empty());
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn is_empty(&self) -> bool {
+    pub const fn is_empty(&self) -> bool {
         self.len() == 0
     }