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<dd>(64-bit version only) Returns a stack backtrace for the current point of
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program execution, The list elements are either expressions (denoting function
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or method calls), or symbols followed by their corresponding values. If
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and only the expressions are returned. See also <code><a
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href="refU.html#up">up</a></code> and <code><a
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href="refE.html#env">env</a></code>.