Create error type if reflection class isn't found

Introduce a new diagnostic fired when reflection types aren't found in the
classpath

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/Errors.java

@@ -367,7 +367,9 @@ public interface Errors {
     DiagnosticFactory1<PsiElement, InferenceErrorData> TYPE_INFERENCE_UPPER_BOUND_VIOLATED = DiagnosticFactory1.create(ERROR);
     DiagnosticFactory2<JetExpression, JetType, JetType> TYPE_INFERENCE_EXPECTED_TYPE_MISMATCH = DiagnosticFactory2.create(ERROR);
 
-    // Callable references
+    // Reflection
+
+    DiagnosticFactory0<PsiElement> REFLECTION_TYPES_NOT_LOADED = DiagnosticFactory0.create(ERROR);
 
     DiagnosticFactory1<JetExpression, CallableMemberDescriptor> EXTENSION_IN_CLASS_REFERENCE_NOT_ALLOWED = DiagnosticFactory1.create(ERROR);
     DiagnosticFactory0<JetExpression> CALLABLE_REFERENCE_LHS_NOT_A_CLASS = DiagnosticFactory0.create(ERROR);

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/rendering/DefaultErrorMessages.java

@@ -471,6 +471,8 @@ public class DefaultErrorMessages {
 
         MAP.put(AMBIGUOUS_ANONYMOUS_TYPE_INFERRED, "Right-hand side has anonymous type. Please specify type explicitly", TO_STRING);
 
+        MAP.put(REFLECTION_TYPES_NOT_LOADED, "Reflection types can't be loaded. Please ensure that you have Kotlin Runtime in your classpath");
+
         MAP.put(EXTENSION_IN_CLASS_REFERENCE_NOT_ALLOWED,
                 "''{0}'' is a member and an extension at the same time. References to such elements are not allowed", NAME);
         MAP.put(CALLABLE_REFERENCE_LHS_NOT_A_CLASS, "Callable reference left-hand side cannot be a type parameter");

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetCallableReferenceExpression.java

@@ -33,15 +33,20 @@ public class JetCallableReferenceExpression extends JetExpressionImpl {
         return (JetTypeReference) findChildByType(JetNodeTypes.TYPE_REFERENCE);
     }
 
+    @NotNull
+    public PsiElement getDoubleColonTokenReference() {
+        //noinspection ConstantConditions
+        return findChildByType(JetTokens.COLONCOLON);
+    }
+
     @NotNull
     public JetSimpleNameExpression getCallableReference() {
-        ASTNode node = getNode().findChildByType(JetTokens.COLONCOLON);
-        while (node != null) {
-            PsiElement psi = node.getPsi();
+        PsiElement psi = getDoubleColonTokenReference();
+        while (psi != null) {
             if (psi instanceof JetSimpleNameExpression) {
                 return (JetSimpleNameExpression) psi;
             }
-            node = node.getTreeNext();
+            psi = psi.getNextSibling();
         }
 
         throw new IllegalStateException("Callable reference simple name shouldn't be parsed to null");

compiler/frontend/src/org/jetbrains/jet/lang/reflect/ReflectionTypes.kt

@@ -25,18 +25,19 @@ import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns
 import org.jetbrains.jet.lang.descriptors.annotations.Annotations
 import org.jetbrains.jet.lang.types.JetType
 import org.jetbrains.jet.lang.types.JetTypeImpl
+import org.jetbrains.jet.lang.types.error.ErrorClassDescriptor
+
+private val KOTLIN_REFLECT_FQ_NAME = FqName("kotlin.reflect")
 
 public class ReflectionTypes(private val module: ModuleDescriptor) {
-    private val kotlinReflect: JetScope by Delegates.lazy {
-        // TODO: handle errors gracefully (error types)
-        val kotlin = module.getPackage(FqName("kotlin")) ?: error("Package kotlin not found in $module")
-        val reflect = kotlin.getMemberScope().getPackage(Name.identifier("reflect")) ?: error("Package reflect not found in $kotlin")
-        reflect.getMemberScope()
+    private val kotlinReflectScope: JetScope? by Delegates.lazy {
+        module.getPackage(KOTLIN_REFLECT_FQ_NAME)?.getMemberScope()
     }
 
     fun find(className: String): ClassDescriptor {
         val name = Name.identifier(className)
-        return kotlinReflect.getClassifier(name) as? ClassDescriptor ?: error("Reflection class not found: $name")
+        return kotlinReflectScope?.getClassifier(name) as? ClassDescriptor
+                ?: ErrorClassDescriptor(KOTLIN_REFLECT_FQ_NAME.child(name).asString())
     }
 
     public fun getKFunction(n: Int): ClassDescriptor = find("KFunction$n")
@@ -53,7 +54,10 @@ public class ReflectionTypes(private val module: ModuleDescriptor) {
         val arguments = KotlinBuiltIns.getFunctionTypeArgumentProjections(receiverType, parameterTypes, returnType)
         val classDescriptor = correspondingKFunctionClass(receiverType, extensionFunction, parameterTypes.size)
 
-        return JetTypeImpl(annotations, classDescriptor.getTypeConstructor(), false, arguments, classDescriptor.getMemberScope(arguments))
+        return if (classDescriptor is ErrorClassDescriptor)
+                   classDescriptor.getDefaultType()
+               else
+                   JetTypeImpl(annotations, classDescriptor.getTypeConstructor(), false, arguments, classDescriptor.getMemberScope(arguments))
     }
 
     private fun correspondingKFunctionClass(

compiler/frontend/src/org/jetbrains/jet/lang/types/expressions/BasicExpressionTypingVisitor.java

@@ -503,6 +503,11 @@ public class BasicExpressionTypingVisitor extends ExpressionTypingVisitor {
                 receiverParameter != null
         );
 
+        if (type.isError()) {
+            context.trace.report(REFLECTION_TYPES_NOT_LOADED.on(expression.getDoubleColonTokenReference()));
+            return null;
+        }
+
         AnonymousFunctionDescriptor functionDescriptor = new AnonymousFunctionDescriptor(
                 context.scope.getContainingDeclaration(),
                 Annotations.EMPTY,

compiler/testData/diagnostics/tests/ReflectionTypesNotLoaded.kt

@@ -0,0 +1,8 @@
+fun foo() {}
+
+class A {
+    fun baz() {}
+}
+
+val bar = <!REFLECTION_TYPES_NOT_LOADED!>::<!>foo
+val quux = A<!REFLECTION_TYPES_NOT_LOADED!>::<!>baz

compiler/tests/org/jetbrains/jet/checkers/JetDiagnosticsTestGenerated.java

@@ -374,6 +374,11 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
             doTest("compiler/testData/diagnostics/tests/RecursiveTypeInference.kt");
         }
         
+        @TestMetadata("ReflectionTypesNotLoaded.kt")
+        public void testReflectionTypesNotLoaded() throws Exception {
+            doTest("compiler/testData/diagnostics/tests/ReflectionTypesNotLoaded.kt");
+        }
+        
         @TestMetadata("ResolveOfJavaGenerics.kt")
         public void testResolveOfJavaGenerics() throws Exception {
             doTest("compiler/testData/diagnostics/tests/ResolveOfJavaGenerics.kt");

core/descriptors/src/org/jetbrains/jet/lang/types/ErrorUtils.java

@@ -227,7 +227,7 @@ public class ErrorUtils {
         }
     }
 
-    private static final ErrorClassDescriptor ERROR_CLASS = new ErrorClassDescriptor("");
+    private static final ErrorClassDescriptor ERROR_CLASS = new ErrorClassDescriptor(null);
 
     @NotNull
     public static JetScope createErrorScope(@NotNull String debugMessage) {

core/descriptors/src/org/jetbrains/jet/lang/types/error/ErrorClassDescriptor.java

@@ -17,6 +17,7 @@
 package org.jetbrains.jet.lang.types.error;
 
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.descriptors.*;
 import org.jetbrains.jet.lang.descriptors.annotations.Annotations;
 import org.jetbrains.jet.lang.descriptors.impl.ClassDescriptorImpl;
@@ -32,13 +33,12 @@ import java.util.List;
 
 import static org.jetbrains.jet.lang.types.ErrorUtils.*;
 
-public final class ErrorClassDescriptor extends ClassDescriptorImpl {
-    public ErrorClassDescriptor(@NotNull String debugMessage) {
-        super(getErrorModule(), Name.special("<ERROR CLASS: " + debugMessage + ">"), Modality.OPEN, Collections.<JetType>emptyList());
-
-        ConstructorDescriptorImpl errorConstructor =
-                ConstructorDescriptorImpl.create(this, Annotations.EMPTY, true);
+public class ErrorClassDescriptor extends ClassDescriptorImpl {
+    public ErrorClassDescriptor(@Nullable String name) {
+        super(getErrorModule(), Name.special(name == null ? "<ERROR CLASS>" : "<ERROR CLASS: " + name + ">"),
+              Modality.OPEN, Collections.<JetType>emptyList());
 
+        ConstructorDescriptorImpl errorConstructor = ConstructorDescriptorImpl.create(this, Annotations.EMPTY, true);
         errorConstructor.initialize(Collections.<TypeParameterDescriptor>emptyList(), Collections.<ValueParameterDescriptor>emptyList(),
                                     Visibilities.INTERNAL, false);
         errorConstructor.setReturnType(createErrorType("<ERROR RETURN TYPE>"));