From 6e9b7fe023943778a903e02cb7169b18d03f2be5 Mon Sep 17 00:00:00 2001
From: Paul Backus <snarwin@gmail.com>
Date: Wed, 1 Nov 2023 16:01:01 -0400
Subject: [PATCH] Fix Issue 24215 - isBasicType!Enum should be false

---
 std/traits.d | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/std/traits.d b/std/traits.d
index 2e7a4f6a30b..cc49d76b241 100644
--- a/std/traits.d
+++ b/std/traits.d
@@ -6480,7 +6480,8 @@ enum bool isScalarType(T) = __traits(isScalar, T) && is(T : real);
 /**
  * Detect whether `T` is a basic type (scalar type or void).
  */
-enum bool isBasicType(T) = isScalarType!T || is(immutable T == immutable void);
+enum bool isBasicType(T) =
+    !is(T == enum) && (isScalarType!T || is(immutable T == immutable void));
 
 ///
 @safe unittest
@@ -6500,6 +6501,13 @@ enum bool isBasicType(T) = isScalarType!T || is(immutable T == immutable void);
     static assert(isBasicType!(const(dchar)));
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=24215
+@safe unittest
+{
+    enum E : int { a }
+    static assert(!isBasicType!E);
+}
+
 /**
  * Detect whether `T` is a built-in unsigned numeric type.
  */