inference: propagate variable renames through the call hierarchy; calculate tooltips in tests (IDEA-151948)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/graphInference/VariableNamesOfNestedCalls.java

@@ -0,0 +1,10 @@
+
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+class BigNumber {
+  public <U, V> void toTypeMap(Stream<U> p) {
+    Function<U, V> map2 = p.collect(Collectors.toMap(Function.identity(<caret>), Function.identity()));
+  }
+}