Don't erase the type argument of receiver

checker/jtreg/nullness/type-argument/TypeArgument.java

@@ -0,0 +1,14 @@
+/*
+ * @test
+ * @summary Test case for type argument in method invocation.
+ *
+ * @compile/fail/ref=TypeArgument.out -XDrawDiagnostics -processor org.checkerframework.checker.nullness.NullnessChecker TypeArgument.java
+ */
+public class TypeArgument<T> {
+
+    TypeArgument() {
+        foo();
+    }
+
+    void foo() {}
+}

checker/jtreg/nullness/type-argument/TypeArgument.out

@@ -0,0 +1,4 @@
+TypeArgument.java:10:12: compiler.err.proc.messager: [method.invocation.invalid] call to foo() not allowed on the given receiver.
+found   : @UnderInitialization(TypeArgument.class) TypeArgument<T extends @Initialized Object>
+required: @Initialized TypeArgument<T extends @Initialized Object>
+1 error

framework/src/main/java/org/checkerframework/common/basetype/BaseTypeVisitor.java

@@ -3772,7 +3772,7 @@ protected void checkMethodInvocability(
             return;
         }
 
-        AnnotatedTypeMirror methodReceiver = method.getReceiverType().getErased();
+        AnnotatedTypeMirror methodReceiver = method.getReceiverType();
         AnnotatedTypeMirror treeReceiver = methodReceiver.shallowCopy(false);
         AnnotatedTypeMirror rcv = atypeFactory.getReceiverType(tree);