@notnull

java/java-psi-impl/src/com/intellij/psi/Bottom.java

@@ -62,7 +62,7 @@ public class Bottom extends PsiType {
   }
 
   @Override
-  public <A> A accept(PsiTypeVisitor<A> visitor) {
+  public <A> A accept(@NotNull PsiTypeVisitor<A> visitor) {
     if (visitor instanceof PsiTypeVisitorEx) {
       return ((PsiTypeVisitorEx<A>)visitor).visitBottom(this);
     }

java/java-psi-impl/src/com/intellij/psi/PsiDiamondTypeImpl.java

@@ -74,7 +74,7 @@ public class PsiDiamondTypeImpl extends PsiDiamondType {
   }
 
   @Override
-  public <A> A accept(PsiTypeVisitor<A> visitor) {
+  public <A> A accept(@NotNull PsiTypeVisitor<A> visitor) {
     return visitor.visitDiamondType(this);
   }
 

java/java-psi-impl/src/com/intellij/psi/PsiTypeVariable.java

@@ -15,6 +15,8 @@
  */
 package com.intellij.psi;
 
+import org.jetbrains.annotations.NotNull;
+
 /**
  * Used in Generify refactoring
  */
@@ -27,7 +29,7 @@ public abstract class PsiTypeVariable extends PsiType {
   public abstract boolean isValidInContext (PsiType type);
 
   @Override
-  public <A> A accept(PsiTypeVisitor<A> visitor) {
+  public <A> A accept(@NotNull PsiTypeVisitor<A> visitor) {
     if (visitor instanceof PsiTypeVisitorEx) {
       return ((PsiTypeVisitorEx<A>)visitor).visitTypeVariable(this);
     }