Fix crash when requiring REXML #15
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ConstantExtraction.constant_value was attempting to
evaluate """, which threw a syntax error. Changed
it to eval %Q{} or "" depending on what the code under
analysis uses.
The overflow happened while doing pre-order traversal of the root sexp - this switches out the recursive definition of Sexp#dfs for an iterative method using a stack.
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ConstantExtraction.constant_value was attempting to
evaluate """, which threw a syntax error. Changed
it to eval %Q{} or "" depending on what the code under
analysis uses.