From d3167c63f84fcf34e81eb78c44c8f70ada07080b Mon Sep 17 00:00:00 2001
From: Marcin Serwin <toxyxer@gmail.com>
Date: Fri, 20 Mar 2020 11:25:39 +0100
Subject: [PATCH] Handle constant arrays with single value

---
 clippy_lints/src/consts.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/clippy_lints/src/consts.rs b/clippy_lints/src/consts.rs
index c25200c33388..b91607129158 100644
--- a/clippy_lints/src/consts.rs
+++ b/clippy_lints/src/consts.rs
@@ -356,6 +356,17 @@ fn index(&mut self, lhs: &'_ Expr<'_>, index: &'_ Expr<'_>) -> Option<Constant>
                 Constant::F64(x) => Some(Constant::F64(x)),
                 _ => None,
             },
+            (Some(Constant::Vec(vec)), _) => {
+                if !vec.is_empty() && vec.iter().all(|x| *x == vec[0]) {
+                    match vec[0] {
+                        Constant::F32(x) => Some(Constant::F32(x)),
+                        Constant::F64(x) => Some(Constant::F64(x)),
+                        _ => None,
+                    }
+                } else {
+                    None
+                }
+            },
             _ => None,
         }
     }