collapse statement lambda to expression lambda: enable for value compatible lambdas (IDEA-122785)

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

@@ -95,12 +95,7 @@ public class RedundantLambdaCodeBlockInspection extends BaseJavaBatchLocalInspec
           return returnStatement.getReturnValue();
         }
         else {
-          final PsiExpression expression = ((PsiExpressionStatement)statements[0]).getExpression();
-          final PsiType psiType = expression.getType();
-          if (psiType != PsiType.VOID) {
-            return null;
-          }
-          return expression;
+          return ((PsiExpressionStatement)statements[0]).getExpression();
         }
       }
     }

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

@@ -0,0 +1,8 @@
+// "Replace with expression lambda" "true"
+class Test {
+  {
+    Runnable c = () -> foo();
+  }
+  
+  int foo() {return 1;}
+}

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

@@ -1,4 +1,4 @@
-// "Replace with expression lambda" "false"
+// "Replace with expression lambda" "true"
 class Test {
   {
     Runnable c = () -> <caret>{foo();};