method references: avoid double substitution (IDEA-126062)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/newMethodRef/IDEA126062.java

@@ -0,0 +1,12 @@
+import java.util.function.Consumer;
+class Pipeline<I, O> implements Consumer<I> {
+  @Override public final void accept(I input) {}
+
+  public <K> void then(Pipeline<O, K> pipeline, final Observable<O> observable) {
+    observable.subscribe(pipeline::accept);
+  }
+}
+
+interface Observable<T> {
+  void subscribe(Consumer<T> x);
+}