Fixed marshaling of typedef'd const char strings.

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -148,7 +148,7 @@ namespace CppSharp.Generators.CSharp
             if (CSharpTypePrinter.IsConstCharString(pointer) || marshalPointeeAsString)
             {
                 Context.Return.Write(MarshalStringToManaged(Context.ReturnVarName,
-                    pointer.GetFinalPointee() as BuiltinType));
+                    pointer.GetFinalPointee().Desugar() as BuiltinType));
                 return true;
             }
 

tests/Common/Common.Tests.cs

@@ -94,6 +94,7 @@ public class CommonTests : GeneratorTestFixture
         str = "Hello";
         hello.StringInOutRef(ref str);
         Assert.That(str, Is.EqualTo("StringInOutRef"));
+        hello.StringTypedef(str);
     }
 
     [Test]

tests/Common/Common.cpp

@@ -270,6 +270,10 @@ void Hello::StringInOutRef(CS_IN_OUT const char*& str)
 		str = "Failed";
 }
 
+void Hello::StringTypedef(const TypedefChar* str)
+{
+}
+
 int unsafeFunction(const Bar& ret, char* testForString, void (*foo)(int))
 {
     return ret.A;

tests/Common/Common.h

@@ -142,6 +142,8 @@ enum Enum
     F = -9
 };
 
+typedef char TypedefChar;
+
 class DLL_API Hello
 {
     union NestedPrivate {
@@ -193,6 +195,8 @@ public:
     void StringOutRef(CS_OUT const char*& str);
     void StringInOut(CS_IN_OUT const char** str);
     void StringInOutRef(CS_IN_OUT const char*& str);
+
+    void StringTypedef(const TypedefChar* str);
 };
 
 class DLL_API AbstractFoo
@@ -1048,3 +1052,4 @@ class DLL_API DerivedFromTemplateInstantiationWithVirtual : public TemplateWithV
 public:
     DerivedFromTemplateInstantiationWithVirtual();
 };
+