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These patches are for Lua 5.3 and 5.4.
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The 'defer' patch adds the defer statement to Lua.
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Note that in Lua 5.4 versions prior to 5.4.3 a deferred closure may be called more than once
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just as the close method of a to-be-closed variable may be called more than once, when exiting the scope.
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I think this is fixed in Lua 5.4.3.
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The original patch for 5.4 is applicable to versions prior to 5.4.3.
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The 5.4.3 version has a new approach to the implementation of toclose values, hence a new patch had to be created.
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