add debug logging to highlight the exception in kdoc if it can't find functions in the model and added a test case

libraries/kdoc/src/main/kotlin/org/jetbrains/kotlin/doc/model/KotlinModel.kt

@@ -267,7 +267,8 @@ class KModel(var context: BindingContext, val config: KDocConfig) {
                 }
             }
         } catch (e: Throwable) {
-            println("Caught exception finding function declarations on $owner")
+            println("Caught exception finding function declarations on $owner $e")
+            e.printStackTrace()
         }
 
     }

libraries/kdoc/src/test/kotlin/test/kotlin/kdoc/KDocTest.kt

@@ -0,0 +1,42 @@
+package test.kotlin.kdoc
+
+import org.jetbrains.kotlin.doc.KDocArguments
+import org.jetbrains.kotlin.doc.KDocCompiler
+
+import kotlin.test.assertTrue
+
+import org.junit.Test
+import java.io.File
+
+/**
+ */
+class KDocTest {
+    Test fun generateKDocForStandardLibrary() {
+        var moduleName = "ApiDocsModule.kt"
+        var dir = "."
+        if (!File(moduleName).exists()) {
+            dir = "kdoc"
+            moduleName = dir + "/" + moduleName
+            assertTrue(File(moduleName).exists(), "Cannot find file $moduleName")
+        }
+        val outDir = File(dir, "target/apidocs")
+        println("Generating library KDocs to $outDir")
+
+        val args = KDocArguments()
+        args.setModule(moduleName)
+        args.setDocOutputDir(outDir.toString())
+        args.setOutputDir("target/classes-stdlib")
+
+        val config = args.docConfig
+        config.title = "Kotlin API"
+        config.ignorePackages.add("org.jetbrains.kotlin")
+        config.ignorePackages.add("java")
+        config.ignorePackages.add("jet")
+        config.ignorePackages.add("junit")
+        config.ignorePackages.add("sun")
+        config.ignorePackages.add("org")
+
+        val compiler = KDocCompiler()
+        compiler.exec(System.out, args)
+    }
+}