Determine correct types for implicit this nodes

.gitignore

@@ -131,6 +131,8 @@ checker/tests/nullness-extra/issue3597/testpkg/Issue3597A.class
 checker/tests/nullness-extra/issue3597/testpkg/Issue3597B.class
 checker/tests/nullness-extra/issue502/Issue502.class
 checker/tests/nullness-extra/issue502/Out.txt
+checker/tests/nullness-extra/issue5174/*.class
+checker/tests/nullness-extra/issue5174/Out.txt
 checker/tests/nullness-extra/issue594/Out.txt
 checker/tests/nullness-extra/issue607/Issue607.class
 checker/tests/nullness-extra/issue607/Issue607Interface.class

checker/tests/nullness-extra/Makefile

@@ -1,5 +1,5 @@
 # Tests that are currently passing
-PASSING_TESTS = Bug109 compat issue265 issue594 issue607 multiple-errors package-anno shorthand issue3597
+PASSING_TESTS = Bug109 compat issue265 issue594 issue607 multiple-errors package-anno shorthand issue3597 issue5174
 ifeq (,$(findstring 1.8,$(shell javac -version)))
   # issue309 and issue502 fail with Java 11 because of differences between Java 8 and Java 11 bytecode.
   # TODO: issue559 should work with an annotated jdk11.
@@ -56,5 +56,8 @@ issue607:
 issue3597:
 	$(MAKE) -C issue3597
 
+issue5174:
+	$(MAKE) -C issue5174
+
 # All tests: passing and failing
 .PHONY: all skipped ${PASSING_TESTS}

checker/tests/nullness-extra/issue5174/Issue5174.java

@@ -0,0 +1,69 @@
+// Test case for Issue 5174:
+// https://github.com/typetools/checker-framework/issues/5174
+
+class Issue5174Super<S> {
+  S methodInner(S in) {
+    return in;
+  }
+
+  S f;
+  static Object sf = "";
+
+  Issue5174Super(S f) {
+    this.f = f;
+  }
+}
+
+class Issue5174Sub<T> extends Issue5174Super<T> {
+  Issue5174Sub(T f) {
+    super(f);
+  }
+
+  void accMethImpl(T in) {
+    Object o = methodInner(in);
+  }
+
+  void accMethExpl(T in) {
+    Object o = this.methodInner(in);
+  }
+
+  void accFieldImpl() {
+    Object o = f;
+  }
+
+  void accFieldExpl() {
+    Object o = this.f;
+  }
+
+  void accStaticField() {
+    Object o;
+    o = sf;
+    o = Issue5174Sub.sf;
+    o = Issue5174Super.sf;
+  }
+
+  class SubNested {
+    void nestedaccMethImpl(T in) {
+      Object o = methodInner(in);
+    }
+
+    void nestedaccMethExpl(T in) {
+      Object o = Issue5174Sub.this.methodInner(in);
+    }
+
+    void nestedaccFieldImpl() {
+      Object o = f;
+    }
+
+    void nestedaccFieldExpl() {
+      Object o = Issue5174Sub.this.f;
+    }
+
+    void nestedaccStaticField() {
+      Object o;
+      o = sf;
+      o = Issue5174Sub.sf;
+      o = Issue5174Super.sf;
+    }
+  }
+}