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-rw-r--r--test/luac.lua6
1 files changed, 3 insertions, 3 deletions
diff --git a/test/luac.lua b/test/luac.lua
index f9aa9052..b009ae9d 100644
--- a/test/luac.lua
+++ b/test/luac.lua
@@ -1,7 +1,7 @@
-- bare-bones luac in Lua
-- usage: lua luac.lua file.lua
-assert(arg[1]~=nil,"usage: lua luac.lua file.lua")
-f=assert(io.open("luac.out","w"))
-f:write(string.dump(loadfile(arg[1])))
+assert(arg[1]~=nil and arg[2]==nil,"usage: lua luac.lua file.lua")
+f=assert(io.open("luac.out","wb"))
+f:write(string.dump(assert(loadfile(arg[1]))))
io.close(f)