isError() implemented for lazy java types

core/descriptor.loader.java/src/org/jetbrains/jet/lang/resolve/java/lazy/types/LazyType.kt

@@ -22,6 +22,8 @@ import org.jetbrains.jet.lang.types.TypeProjection
 import org.jetbrains.jet.lang.descriptors.annotations.AnnotationDescriptor
 import org.jetbrains.jet.lang.resolve.scopes.JetScope
 import org.jetbrains.jet.lang.types.AbstractJetType
+import org.jetbrains.jet.lang.types.ErrorUtils
+import org.jetbrains.kotlin.util.inn
 
 abstract class LazyType(storageManager: StorageManager) : AbstractJetType() {
 
@@ -42,7 +44,7 @@ abstract class LazyType(storageManager: StorageManager) : AbstractJetType() {
 
     override fun isNullable() = false
 
-    override fun isError() = false
+    override fun isError()= getConstructor().getDeclarationDescriptor().inn({ d -> ErrorUtils.isError(d)}, false)
 
     override fun getAnnotations(): List<AnnotationDescriptor> = listOf()
 }

core/util.runtime/src/org/jetbrains/jet/utils/coreLib.kt

@@ -18,6 +18,8 @@ package org.jetbrains.kotlin.util
 
 fun Boolean.iif<T>(then: T, _else: T): T = if (this) then else _else
 
+fun <T: Any, R> T?.inn(then: (T) -> R, _else: R): R = if (this != null) then(this) else _else
+
 // These two functions are needed in conjunction with iif:
 // foo.eq(bar).iif(a, b)
 fun <T> T.eq(eq: T): Boolean = this == eq