https://git.ruby-lang.org/ruby.git/commit/?id=0cf9197988

From 0cf9197988a72f0defb670a8f03f8427d41c4bec Mon Sep 17 00:00:00 2001
From: xtkoba <69125751+xtkoba@u...>
Date: Sun, 2 May 2021 15:45:42 +0900
Subject: Clang never evaluates expr in `__builtin_assume`

---
 win32/win32.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/win32/win32.c b/win32/win32.c
index 23a69fda4d..c938e197a7 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -5345,11 +5345,13 @@ get_attr_vsn(const WCHAR *path, DWORD *atts, DWORD *vsn) https://github.com/ruby/ruby/blob/trunk/win32/win32.c#L5345
     HANDLE h = open_special(path, 0, FILE_FLAG_OPEN_REPARSE_POINT);
 
     if (h == INVALID_HANDLE_VALUE) {
-	ASSUME(e = GetLastError());
+	e = GetLastError();
+	ASSUME(e);
 	return e;
     }
     if (!GetFileInformationByHandle(h, &st)) {
-	ASSUME(e = GetLastError());
+	e = GetLastError();
+	ASSUME(e);
     }
     else {
 	*atts = st.dwFileAttributes;
-- 
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