Fix issue sq#682

Proxies/Char.cs

@@ -0,0 +1,41 @@
+#pragma warning disable 0660
+#pragma warning disable 0661
+
+using System;
+using System.Collections.Generic;
+using JSIL.Meta;
+using JSIL.Proxy;
+
+namespace JSIL.Proxies {
+    [JSProxy(
+        typeof(char),
+        JSProxyMemberPolicy.ReplaceDeclared
+    )]
+    public abstract class CharProxy {
+        [JSReplacement("$c.toLowerCase()")]
+        [JSIsPure]
+        public static char ToLower (char c) {
+            throw new InvalidOperationException();
+        }
+
+        // FIXME: Are ECMAScript strings always normalized?
+        [JSReplacement("$c.toLowerCase()")]
+        [JSIsPure]
+        public static char ToLowerInvariant (char c) {
+            throw new InvalidOperationException();
+        }
+
+        [JSReplacement("$c.toUpperCase()")]
+        [JSIsPure]
+        public static char ToUpper (char c) {
+            throw new InvalidOperationException();
+        }
+
+        // FIXME: Are ECMAScript strings always normalized?
+        [JSReplacement("$c.toUpperCase()")]
+        [JSIsPure]
+        public static char ToUpperInvariant (char c) {
+            throw new InvalidOperationException();
+        }
+    }
+}

Proxies/Proxies.4.0.csproj

@@ -37,6 +37,7 @@
     <Compile Include="Array.cs" />
     <Compile Include="Console.cs" />
     <Compile Include="Collections.cs" />
+    <Compile Include="Char.cs" />
     <Compile Include="Unsafe.cs" />
     <Compile Include="DateTime.cs" />
     <Compile Include="IO.cs" />

Tests/SimpleTestCases/Issue682.cs

@@ -0,0 +1,10 @@
+using System;
+
+public static class Program {
+    public static void Main (string[] args) {
+        Console.WriteLine(char.ToLower('a'));
+        Console.WriteLine(char.ToUpper('a'));
+        Console.WriteLine(char.ToLower('A'));
+        Console.WriteLine(char.ToUpper('A'));
+    }
+}

Tests/SimpleTests.csproj

@@ -90,6 +90,7 @@
     <None Include="SimpleTestCases\Issue491.cs" />
     <None Include="SimpleTestCases\Issue491_2.cs" />
     <None Include="SimpleTestCases\Issue491_3.cs" />
+    <None Include="SimpleTestCases\Issue682.cs" />
     <Compile Include="SimpleTestCases\ReflectionGenericMethodInvoke.cs" />
     <Compile Include="ExpressionTests.cs" />
     <Compile Include="SimpleTests.cs" />