Minor clarification on side effects of a function.
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@ -26,7 +26,7 @@ bool matchesVariableDeclaration(const ast::Term &term, const ast::VariableDeclar
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// Extracts the term t if the given formula is of the form “X = t” and X matches the given variable
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// The input formula is not usable if a term is returned
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// The input formula is no longer usable after this call if a term is returned
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std::experimental::optional<ast::Term> extractAssignedTerm(ast::Formula &formula, const ast::VariableDeclaration &variableDeclaration)
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{
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if (!formula.is<ast::Comparison>())
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