From 3cadbfc7419542a8b56f0996bfbfbda146a30ea5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9C=80=E8=90=8C=E5=B0=8F=E6=B1=90?= <sumneko@hotmail.com>
Date: Sat, 23 Apr 2022 23:46:53 +0800
Subject: fix infer of `unknown and unknown`

---
 make/bootstrap.lua | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'make')

diff --git a/make/bootstrap.lua b/make/bootstrap.lua
index 6c27cf95..00036f34 100644
--- a/make/bootstrap.lua
+++ b/make/bootstrap.lua
@@ -69,6 +69,9 @@ package.searchers[2] = function (name)
         return err
     end
     local f = io.open(filename)
+    if not f then
+        return 'cannot open file:' .. filename
+    end
     local buf = f:read '*a'
     f:close()
     local relative = filename:sub(1, #root) == root and filename:sub(#root + 2) or filename
-- 
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