disable add type cast fix for non-denotable types (IDEA-149787)

java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/quickfix/AddTypeCastFix.java

@@ -33,6 +33,7 @@ import com.intellij.openapi.project.Project;
 import com.intellij.psi.*;
 import com.intellij.psi.codeStyle.CodeStyleManager;
 import com.intellij.psi.codeStyle.JavaCodeStyleManager;
+import com.intellij.psi.util.PsiTypesUtil;
 import com.intellij.psi.util.PsiUtil;
 import com.intellij.psi.util.TypeConversionUtil;
 import org.jetbrains.annotations.NotNull;
@@ -65,7 +66,10 @@ public class AddTypeCastFix extends LocalQuickFixAndIntentionActionOnPsiElement
                              @NotNull PsiFile file,
                              @NotNull PsiElement startElement,
                              @NotNull PsiElement endElement) {
-    return myType.isValid() && startElement.isValid() && startElement.getManager().isInProject(startElement);
+    return myType.isValid() &&
+           PsiTypesUtil.isDenotableType(myType) &&
+           startElement.isValid() && 
+           startElement.getManager().isInProject(startElement);
   }
 
   @Override

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/addTypeCast/beforeNonDenotableCastType.java

@@ -0,0 +1,7 @@
+// "Cast to '?'" "false"
+class Scope<T> {
+  T val;
+  void f(Scope<?> s) {
+    s.val = <caret>"";
+  }
+}