feat: refine class inheritance test cases and introduce runtime error scenarios

Author: ryan-gang

test_programs/i1/1.lox

@@ -1,12 +1,9 @@
 ---
 expected_error_type: none
 ---
-class Doughnut {
-  cook() {
-    print "Fry until golden brown.";
-    }
-  }
+class Doughnut {}
 
 class BostonCream < Doughnut {}
 
-BostonCream().cook();
+print Doughnut();
+print BostonCream();

test_programs/i1/2.lox

@@ -1,11 +1,14 @@
 ---
 expected_error_type: none
 ---
-class A {}
+{
+  class A {}
 
-fun f() {
   class B < A {}
-  return B;
-}
 
-print f(); // expect: B
+  class C < A {}
+
+  print A();
+  print B();
+  print C();
+}

test_programs/i1/3.lox

@@ -1,4 +1,11 @@
 ---
-expected_error_type: compile
+expected_error_type: none
 ---
-class Foo < Foo {} // Error at 'Foo': A class can't inherit from itself.
+class A {}
+
+fun f() {
+  class B < A {}
+  return B;
+}
+
+print f(); // expect: B

test_programs/i1/4.lox

@@ -1,7 +1,4 @@
 ---
 expected_error_type: compile
 ---
-{
-  class Foo < Foo {} // Error at 'Foo': A class can't inherit from itself.
-}
-// [c line 5] Error at end: Expect '}' after block.
+class Foo < Foo {} // Error at 'Foo': A class can't inherit from itself.

test_programs/i1/5.lox

@@ -0,0 +1,9 @@
+---
+expected_error_type: runtime
+---
+fun A() {}
+
+class B < A {}
+
+print A();
+print B();

test_programs/i1/6.lox

@@ -0,0 +1,8 @@
+---
+expected_error_type: runtime
+---
+var A = "class";
+
+class B < A {}
+
+print B();