highlight unresolved references in KDoc

idea/idea-analysis/src/org/jetbrains/kotlin/idea/kdoc/KDocReference.kt

@@ -70,6 +70,8 @@ public class KDocReference(element: KDocName): JetMultiReference<KDocName>(eleme
         val newLink = KDocElementFactory(getElement().getProject()).createNameFromText(newText)
         return getElement().replace(newLink)
     }
+
+    override fun getCanonicalText(): String = getElement().getNameText()
 }
 
 public fun resolveKDocLink(session: KotlinCodeAnalyzer,

idea/idea-analysis/src/org/jetbrains/kotlin/idea/kdoc/KDocUnresolvedReferenceInspection.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.kdoc
+
+import org.jetbrains.kotlin.idea.inspections.AbstractKotlinInspection
+import com.intellij.codeInspection.ProblemsHolder
+import com.intellij.psi.PsiElementVisitor
+import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.kdoc.psi.impl.KDocName
+
+public class KDocUnresolvedReferenceInspection(): AbstractKotlinInspection() {
+    override fun buildVisitor(holder: ProblemsHolder, isOnTheFly: Boolean): PsiElementVisitor =
+        KDocUnresolvedReferenceVisitor(holder)
+
+    private class KDocUnresolvedReferenceVisitor(private val holder: ProblemsHolder): PsiElementVisitor() {
+        override fun visitElement(element: PsiElement) {
+            if (element is KDocName) {
+                val ref = element.getReference()
+                if (ref != null && ref.resolve() == null) {
+                    holder.registerProblem(ref)
+                }
+            }
+        }
+    }
+}

idea/src/META-INF/plugin.xml

@@ -832,7 +832,13 @@
         enabledByDefault="true"
         level="WARNING"
         />
-      
+
+    <localInspection implementationClass="org.jetbrains.kotlin.idea.kdoc.KDocUnresolvedReferenceInspection"
+        displayName="Unresolved reference in KDoc"
+        groupName="Kotlin"
+        enabledByDefault="true"
+        level="WARNING"
+        />
     <project.converterProvider implementation="org.jetbrains.kotlin.idea.converters.JetRunConfigurationSettingsFormatConverterProvider"/>
 
   </extensions>