QL code and tests for C#/C++/JavaScript.

csharp/ql/src/Dead Code/DeadStoreOfLocalBad.cs

@@ -0,0 +1,55 @@
+using System;
+
+class Bad
+{
+    double ParseInt(string s)
+    {
+        var success = int.TryParse(s, out int i);
+        return i;
+    }
+
+    bool IsDouble(string s)
+    {
+        var success = double.TryParse(s, out double i);
+        return success;
+    }
+
+    double ParseDouble(string s)
+    {
+        try
+        {
+            return double.Parse(s);
+        }
+        catch (FormatException e)
+        {
+            return double.NaN;
+        }
+    }
+
+    int Count(string[] ss)
+    {
+        int count = 0;
+        foreach (var s in ss)
+            count++;
+        return count;
+    }
+
+    string IsInt(object o)
+    {
+        if (o is int i)
+            return "yes";
+        else
+            return "no";
+    }
+
+    string IsString(object o)
+    {
+        switch (o)
+        {
+            case string s:
+                return "yes";
+            default:
+                return "no";
+        }
+    }
+}