redundant lambda code block: do not suggest for expressions with non-void type

java/java-impl/src/com/intellij/codeInspection/RedundantLambdaCodeBlockInspection.java

@@ -97,7 +97,12 @@ public class RedundantLambdaCodeBlockInspection extends BaseJavaLocalInspectionT
           return returnStatement.getReturnValue();
         }
         else {
-          return ((PsiExpressionStatement)statements[0]).getExpression();
+          final PsiExpression expression = ((PsiExpressionStatement)statements[0]).getExpression();
+          final PsiType psiType = expression.getType();
+          if (psiType != PsiType.VOID) {
+            return null;
+          }
+          return expression;
         }
       }
     }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/lambdaCodeBlock2Expr/beforeReturnTypeInExpressionStatement.java

@@ -0,0 +1,8 @@
+// "Replace with one line expression" "false"
+class Test {
+  {
+    Runnable c = () -> <caret>{foo();};
+  }
+  
+  int foo() {return 1;}
+}