Register accessor closures when they are bound

Previously we only registered record accessor closures in anonymous
contexts, where we assume they must already be specialized based on the
surrounding contexts. This is not true in general since one might bind
an accessor to a name.

Closes #2567

compiler/solve/tests/solve_expr.rs

@@ -5529,4 +5529,18 @@ mod solve_expr {
             r#"a -> Effect a"#,
         )
     }
+
+    #[test]
+    fn generalized_accessor_function_applied() {
+        infer_eq_without_problem(
+            indoc!(
+                r#"
+                returnFoo = .foo
+
+                returnFoo { foo: "foo" }
+                "#
+            ),
+            "Str",
+        )
+    }
 }