I've never been 100% sure whether referencing $^E, (which I always use myself), is effectively a synchronous call to GetLastError(), or whether it ($^E) only get's set if the XS code arranges to do so? Hence my reluctance to recommend $^E to others directly.
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The "get magic" on $^E is simply GetLastError() along with building a string out of the number returned.
But there is a problem with XS modules not arranging for $^E to be set, but that is because several XS modules use API(s) that return a failure code and the XS code fails to call SetLastError(), which means that calling Win32::GetLastError() doesn't get around such problems anyway.
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