[Evaluator test] Pull in std::isnan.

DougGregor · DougGregor · commit f9db209c72e1 · 2018-06-12T09:42:10.000-07:00
diff --git a/unittests/AST/ArithmeticEvaluator.cpp b/unittests/AST/ArithmeticEvaluator.cpp
@@ -23,6 +23,7 @@
 
 using namespace swift;
 using namespace llvm;
+using std::isnan;
 
 class ArithmeticExpr {
  public:
