new inference: ensure type parameters are not modified during ground type evaluation

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

@@ -0,0 +1,17 @@
+import java.util.*;
+import java.util.stream.*;
+
+class Test {
+
+  {
+    Collector<Employee, ?, Map<Department, List<Employee>>> objectMapCollector = Collectors.groupingBy(Employee::getDepartment);
+  }
+
+  private class Employee {
+    public Department getDepartment() {
+      return new Department();
+    }
+  }
+
+  private class Department {}
+}