Add more tests for PR 14380

Related to 07bde5063b5a3a83f61e85f00a1c6ce6e0a097d2

original commit: d2a3849c6ff39e3c68ce0d1e7fc531352c0086e9

pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/tests/pr14380.rkt

@@ -0,0 +1,27 @@
+#;#;
+#<<END
+TR info: pr14380.rkt 11:15 foo -- struct constructor
+END
+#<<END
+#<procedure:unbox>
+#<procedure:magnitude>
+#<procedure:list-ref>
+#<procedure:+>
+#<procedure:car>
+#<procedure:string-length>
+#<procedure:foo-x>
+
+END
+#lang typed/racket
+#reader tests/typed-racket/optimizer/reset-port
+
+;; Test for PR14380. None of these should get optimized.
+
+(begin0 unbox (box 3))
+(begin0 magnitude 3.0+5.0i)
+(begin0 list-ref '(a b c) 0)
+(begin0 + 3)
+(begin0 car '(a b))
+(begin0 string-length "foo")
+(struct foo ([x : String]))
+(begin0 foo-x (foo "foo"))