inline: do not delete call but warn when resulted expr is not a valid statement (IDEA-88886)

java/java-tests/testData/refactoring/inlineMethod/NotAStatement.java

@@ -0,0 +1,26 @@
+class AAA {
+  void fff(Project myProject) {
+    ensureFilesWritable(myProject, new String[1]);
+  }
+
+  private boolean ensu<caret>reFilesWritable(final Project project, final String... strings) {
+    return !ensureFilesWritable(strings).hasReadonlyFiles();
+  }
+
+  private Status ensureFilesWritable(final String[] strings) {
+    return new Status(strings);
+  }
+
+  class Status {
+    public Status(final String[] strings) {
+      //To change body of created methods use File | Settings | File Templates.
+    }
+
+    boolean hasReadonlyFiles() {
+      return true;
+    }
+  }
+
+  class Project {
+  }
+}