Revert "fix DescriptionRenderer failure if FunctionDescriptor.getReturnType returns null"

Problem will be fixed by removing @NotNull modifier.

This reverts commit fed075b0ca.

compiler/frontend/src/org/jetbrains/jet/lang/descriptors/CallableDescriptor.java

@@ -1,7 +1,6 @@
 package org.jetbrains.jet.lang.descriptors;
 
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.resolve.scopes.receivers.ReceiverDescriptor;
 import org.jetbrains.jet.lang.types.JetType;
 import org.jetbrains.jet.lang.types.TypeSubstitutor;
@@ -25,9 +24,6 @@ public interface CallableDescriptor extends DeclarationDescriptor {
     @NotNull
     JetType getReturnType();
 
-    @Nullable
-    JetType getReturnTypeSafe();
-
     @NotNull
     @Override
     CallableDescriptor getOriginal();

compiler/frontend/src/org/jetbrains/jet/lang/descriptors/FunctionDescriptorImpl.java

@@ -125,12 +125,6 @@ public class FunctionDescriptorImpl extends DeclarationDescriptorImpl implements
         return unsubstitutedReturnType;
     }
 
-    @Override
-    @Nullable
-    public JetType getReturnTypeSafe() {
-        return unsubstitutedReturnType;
-    }
-
     @NotNull
     @Override
     public FunctionDescriptor getOriginal() {

compiler/frontend/src/org/jetbrains/jet/lang/descriptors/PropertyDescriptor.java

@@ -119,11 +119,6 @@ public class PropertyDescriptor extends VariableDescriptorImpl implements Callab
         return getOutType();
     }
 
-    @Override
-    @Nullable
-    public JetType getReturnTypeSafe() {
-        return getOutType();
-    }
 
     public boolean isVar() {
         return isVar;

compiler/frontend/src/org/jetbrains/jet/lang/descriptors/PropertyGetterDescriptor.java

@@ -40,12 +40,6 @@ public class PropertyGetterDescriptor extends PropertyAccessorDescriptor {
         return returnType;
     }
 
-    @Override
-    @Nullable
-    public JetType getReturnTypeSafe() {
-        return returnType;
-    }
-
     @Override
     public <R, D> R accept(DeclarationDescriptorVisitor<R, D> visitor, D data) {
         return visitor.visitPropertyGetterDescriptor(this, data);

compiler/frontend/src/org/jetbrains/jet/lang/descriptors/PropertySetterDescriptor.java

@@ -48,11 +48,6 @@ public class PropertySetterDescriptor extends PropertyAccessorDescriptor {
         return JetStandardClasses.getUnitType();
     }
 
-    @Override
-    public JetType getReturnTypeSafe() {
-        return getReturnType();
-    }
-
     @Override
     public <R, D> R accept(DeclarationDescriptorVisitor<R, D> visitor, D data) {
         return visitor.visitPropertySetterDescriptor(this, data);

compiler/frontend/src/org/jetbrains/jet/lang/descriptors/VariableDescriptorImpl.java

@@ -89,10 +89,4 @@ public abstract class VariableDescriptorImpl extends DeclarationDescriptorImpl i
     public JetType getReturnType() {
         return getOutType();
     }
-
-    @Override
-    @Nullable
-    public JetType getReturnTypeSafe() {
-        return getOutType();
-    }
 }

compiler/frontend/src/org/jetbrains/jet/resolve/DescriptorRenderer.java

@@ -73,11 +73,7 @@ public class DescriptorRenderer implements Renderer {
     }
 
     public String renderType(JetType type) {
-        if (type == null) {
-            return escape("<?>");
-        } else {
-            return escape(type.toString());
-        }
+        return escape(type.toString());
     }
 
     protected String escape(String s) {
@@ -226,7 +222,8 @@ public class DescriptorRenderer implements Renderer {
 
             renderName(descriptor, builder);
             renderValueParameters(descriptor, builder);
-            builder.append(" : ").append(escape(renderType(descriptor.getReturnTypeSafe())));
+            // TODO: getReturnType may be uninitialized and throw IllegalStateException // stepan.koltsov@ 2011-11-21
+            builder.append(" : ").append(escape(renderType(descriptor.getReturnType())));
             return super.visitFunctionDescriptor(descriptor, builder);
         }