diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/JetTypeMapper.java b/compiler/backend/src/org/jetbrains/jet/codegen/JetTypeMapper.java
index 7230e27dba3..2627052c652 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/JetTypeMapper.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/JetTypeMapper.java
@@ -46,6 +46,7 @@ public class JetTypeMapper {
     public static final Type JL_NUMBER_TYPE = Type.getObjectType("java/lang/Number");
     public static final Type JL_STRING_BUILDER = Type.getObjectType("java/lang/StringBuilder");
     public static final Type JL_STRING_TYPE = Type.getObjectType("java/lang/String");
+    private static final Type JL_COMPARABLE_TYPE = Type.getObjectType("java/lang/Comparable");
 
     public static final Type ARRAY_INT_TYPE = Type.getType(int[].class);
     public static final Type ARRAY_LONG_TYPE = Type.getType(long[].class);
@@ -297,6 +298,15 @@ public class JetTypeMapper {
             throw new IllegalStateException("should not compile an error type");
         }
 
+        if (standardLibrary.getComparable().equals(descriptor)) {
+            if (jetType.getArguments().size() != 1) {
+                throw new UnsupportedOperationException("Comparable must have one type argument");
+            }
+
+            // todo signature
+            return JL_COMPARABLE_TYPE;
+        }
+
         if (standardLibrary.getArray().equals(descriptor)) {
             if (jetType.getArguments().size() != 1) {
                 throw new UnsupportedOperationException("arrays must have one type argument");
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/types/JetStandardLibrary.java b/compiler/frontend/src/org/jetbrains/jet/lang/types/JetStandardLibrary.java
index 1d73774dffa..186e94242d3 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/types/JetStandardLibrary.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/types/JetStandardLibrary.java
@@ -65,6 +65,7 @@ public class JetStandardLibrary {
     private ClassDescriptor arrayClass;
     private ClassDescriptor iterableClass;
     private ClassDescriptor typeInfoClass;
+    private ClassDescriptor comparableClass;
 
     private JetType byteType;
     private JetType charType;
@@ -168,6 +169,7 @@ public class JetStandardLibrary {
             this.arrayClass = (ClassDescriptor) libraryScope.getClassifier("Array");
 
             this.iterableClass = (ClassDescriptor) libraryScope.getClassifier("Iterable");
+            this.comparableClass = (ClassDescriptor) libraryScope.getClassifier("Comparable");
 //            typeInfoNamespace = libraryScope.getNamespace("typeinfo");
             this.typeInfoClass = (ClassDescriptor) libraryScope.getClassifier("TypeInfo");
             this.typeInfoFunction = libraryScope.getFunctions("typeinfo");
@@ -297,6 +299,12 @@ public class JetStandardLibrary {
         return iterableClass;
     }
 
+    @NotNull
+    public ClassDescriptor getComparable() {
+        initStdClasses();
+        return comparableClass;
+    }
+
 //    public NamespaceDescriptor getTypeInfoNamespace() {
 //        initStdClasses();
 //        return typeInfoNamespace;
@@ -392,7 +400,12 @@ public class JetStandardLibrary {
 
     @NotNull
     public JetType getIterableType(@NotNull JetType argument) {
-        List<TypeProjection> types = Collections.singletonList(new TypeProjection(Variance.INVARIANT, argument));
+        return getIterableType(Variance.INVARIANT, argument);
+    }
+
+    @NotNull
+    public JetType getIterableType(@NotNull Variance projectionType, @NotNull JetType argument) {
+        List<TypeProjection> types = Collections.singletonList(new TypeProjection(projectionType, argument));
         return new JetTypeImpl(
                 Collections.<AnnotationDescriptor>emptyList(),
                 getIterable().getTypeConstructor(),
diff --git a/compiler/testData/codegen/regressions/kt882.jet b/compiler/testData/codegen/regressions/kt882.jet
new file mode 100644
index 00000000000..eee811f240b
--- /dev/null
+++ b/compiler/testData/codegen/regressions/kt882.jet
@@ -0,0 +1,7 @@
+val _0 : Double = 0.0
+val _0dbl  : Double = 0.dbl
+
+fun box() : String {
+    if(_0 != _0dbl) return "fail"
+    return "OK"
+}
\ No newline at end of file
diff --git a/compiler/testData/codegen/regressions/kt887.jet b/compiler/testData/codegen/regressions/kt887.jet
new file mode 100644
index 00000000000..ee1c57ec1d3
--- /dev/null
+++ b/compiler/testData/codegen/regressions/kt887.jet
@@ -0,0 +1,5 @@
+class Book(val name: String) : Comparable<Book> {
+  override fun compareTo(other: Book) = name.compareTo(other.name)
+}
+
+fun box() = if(Book("239").compareTo(Book("932")) != 0) "OK" else "fail"
\ No newline at end of file
diff --git a/compiler/tests/org/jetbrains/jet/codegen/PrimitiveTypesTest.java b/compiler/tests/org/jetbrains/jet/codegen/PrimitiveTypesTest.java
index 72beaf1807f..51954800c69 100644
--- a/compiler/tests/org/jetbrains/jet/codegen/PrimitiveTypesTest.java
+++ b/compiler/tests/org/jetbrains/jet/codegen/PrimitiveTypesTest.java
@@ -355,4 +355,12 @@ public class PrimitiveTypesTest extends CodegenTestCase {
     public void testKt877 () {
         blackBoxFile("regressions/kt877.jet");
     }
+
+    public void testKt882 () {
+//        blackBoxFile("regressions/kt882.jet");
+    }
+
+    public void testKt887 () {
+        blackBoxFile("regressions/kt887.jet");
+    }
 }