added lox test files

lox.t/while/class_in_body.lox

@@ -0,0 +1,2 @@
+// [line 2] Error at 'class': Expect expression.
+while (true) class Foo {}

lox.t/while/closure_in_body.lox

@@ -0,0 +1,19 @@
+var f1;
+var f2;
+var f3;
+
+var i = 1;
+while (i < 4) {
+  var j = i;
+  fun f() { print j; }
+
+  if (j == 1) f1 = f;
+  else if (j == 2) f2 = f;
+  else f3 = f;
+
+  i = i + 1;
+}
+
+f1(); // expect: 1
+f2(); // expect: 2
+f3(); // expect: 3

lox.t/while/fun_in_body.lox

@@ -0,0 +1,2 @@
+// [line 2] Error at 'fun': Expect expression.
+while (true) fun foo() {}

lox.t/while/return_closure.lox

@@ -0,0 +1,10 @@
+fun f() {
+  while (true) {
+    var i = "i";
+    fun g() { print i; }
+    return g;
+  }
+}
+
+var h = f();
+h(); // expect: i

lox.t/while/return_inside.lox

@@ -0,0 +1,9 @@
+fun f() {
+  while (true) {
+    var i = "i";
+    return i;
+  }
+}
+
+print f();
+// expect: i

lox.t/while/syntax.lox

@@ -0,0 +1,21 @@
+// Single-expression body.
+var c = 0;
+while (c < 3) print c = c + 1;
+// expect: 1
+// expect: 2
+// expect: 3
+
+// Block body.
+var a = 0;
+while (a < 3) {
+  print a;
+  a = a + 1;
+}
+// expect: 0
+// expect: 1
+// expect: 2
+
+// Statement bodies.
+while (false) if (true) 1; else 2;
+while (false) while (true) 1;
+while (false) for (;;) 1;

lox.t/while/var_in_body.lox

@@ -0,0 +1,2 @@
+// [line 2] Error at 'var': Expect expression.
+while (true) var foo;