From f8fbd2976ddcd736ab0c0177f8b70a32e9a4fc98 Mon Sep 17 00:00:00 2001
From: crimaniak <crimaniak@gmail.com>
Date: Thu, 15 Mar 2018 23:48:34 +0300
Subject: [PATCH] Add error message for static assert in bitmanip.d

Static assert, checking the number of bits for a field with the type
bool, did not have an error message.
---
 std/bitmanip.d | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/std/bitmanip.d b/std/bitmanip.d
index f6ce8602d..f8b2e7bd4 100644
--- a/std/bitmanip.d
+++ b/std/bitmanip.d
@@ -107,7 +107,8 @@ private template createAccessors(
 
         static if (is(T == bool))
         {
-            static assert(len == 1);
+            static assert(len == 1, "`" ~ name ~
+                    "` definition problem: type `bool` is only allowed for single-bit fields");
             enum result =
             // getter
                 "@property bool " ~ name ~ "() @safe pure nothrow @nogc const { return "