[intention-preview] IDEA-317060 fix creation of a statement from expression

GitOrigin-RevId: 95c10072de86b6c86354823c9dec8a828bebcef4

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

@@ -45,6 +45,7 @@ public final class RemoveUnusedVariableUtil {
     List<PsiElement> sideEffects = new ArrayList<>();
     boolean hasSideEffects = checkSideEffects(element, variableToIgnore, sideEffects);
     if (!hasSideEffects || sideEffects.isEmpty()) return RemoveMode.DELETE_ALL;
+    if (!PsiUtil.isStatement(element)) return RemoveMode.DELETE_ALL;
     return RemoveMode.MAKE_STATEMENT;
   }
 

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/unusedAssignment/afterSwitchExpessionSideEffect.java

@@ -0,0 +1,7 @@
+// "Remove redundant initializer" "true-preview"
+class A {
+  void test2(){
+
+    String str;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/unusedAssignment/beforeSwitchExpessionSideEffect.java

@@ -0,0 +1,15 @@
+// "Remove redundant initializer" "true-preview"
+class A {
+  void test2(){
+
+    String str =  switch<caret>   (1) {
+      case 1 -> "a";
+      default ->
+      {
+        str = "b";
+        System.out.println(str);
+        yield str + "c";
+      }
+    };
+  }
+}