From 57c8ff9befd19c077f73de7adc7a72475ad03b0a Mon Sep 17 00:00:00 2001
From: Barry Revzin <barry.revzin@gmail.com>
Date: Wed, 25 Jan 2023 21:56:09 -0600
Subject: [PATCH] Allowing formatting non-copyable ranges.

---
 include/fmt/ranges.h |  3 +--
 test/ranges-test.cc  | 13 +++++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/include/fmt/ranges.h b/include/fmt/ranges.h
index 0b6ec900..d65de361 100644
--- a/include/fmt/ranges.h
+++ b/include/fmt/ranges.h
@@ -154,8 +154,7 @@ struct has_const_begin_end<
 template <typename T>
 struct has_mutable_begin_end<
     T, void_t<decltype(detail::range_begin(std::declval<T>())),
-              decltype(detail::range_end(std::declval<T>())),
-              enable_if_t<std::is_copy_constructible<T>::value>>>
+              decltype(detail::range_end(std::declval<T>()))>>
     : std::true_type {};
 
 template <typename T>
diff --git a/test/ranges-test.cc b/test/ranges-test.cc
index fa46fc41..ae069665 100644
--- a/test/ranges-test.cc
+++ b/test/ranges-test.cc
@@ -406,3 +406,16 @@ TEST(ranges_test, range_of_range_of_mixed_const) {
 TEST(ranges_test, vector_char) {
   EXPECT_EQ(fmt::format("{}", std::vector<char>{'a', 'b'}), "['a', 'b']");
 }
+
+TEST(ranges_test, range_of_noncopyable) {
+  struct V {
+    int i;
+    V(int v) : i(v) { }
+    V(V&&) = default;
+    auto operator=(V&&) -> V& = default;
+
+    auto begin() -> int* { return &i; }
+    auto end() -> int* { return &i + 1; }
+  };
+  EXPECT_EQ(fmt::format("{}", V(1)), "[1]");
+}