added lox test files

lox.t/for/class_in_body.lox

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

lox.t/for/closure_in_body.lox

@@ -0,0 +1,22 @@
+var f1;
+var f2;
+var f3;
+
+for (var i = 1; i < 4; i = i + 1) {
+  var j = i;
+  fun f() {
+    print i;
+    print j;
+  }
+
+  if (j == 1) f1 = f;
+  else if (j == 2) f2 = f;
+  else f3 = f;
+}
+
+f1(); // expect: 4
+      // expect: 1
+f2(); // expect: 4
+      // expect: 2
+f3(); // expect: 4
+      // expect: 3

lox.t/for/fun_in_body.lox

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

lox.t/for/return_closure.lox

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

lox.t/for/return_inside.lox

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

lox.t/for/scope.lox

@@ -0,0 +1,26 @@
+{
+  var i = "before";
+
+  // New variable is in inner scope.
+  for (var i = 0; i < 1; i = i + 1) {
+    print i; // expect: 0
+
+    // Loop body is in second inner scope.
+    var i = -1;
+    print i; // expect: -1
+  }
+}
+
+{
+  // New variable shadows outer variable.
+  for (var i = 0; i > 0; i = i + 1) {}
+
+  // Goes out of scope after loop.
+  var i = "after";
+  print i; // expect: after
+
+  // Can reuse an existing variable.
+  for (i = 0; i < 1; i = i + 1) {
+    print i; // expect: 0
+  }
+}

lox.t/for/statement_condition.lox

@@ -0,0 +1,3 @@
+// [line 3] Error at '{': Expect expression.
+// [line 3] Error at ')': Expect ';' after expression.
+for (var a = 1; {}; a = a + 1) {}

lox.t/for/statement_increment.lox

@@ -0,0 +1,2 @@
+// [line 2] Error at '{': Expect expression.
+for (var a = 1; a < 2; {}) {}

lox.t/for/statement_initializer.lox

@@ -0,0 +1,3 @@
+// [line 3] Error at '{': Expect expression.
+// [line 3] Error at ')': Expect ';' after expression.
+for ({}; a < 2; a = a + 1) {}

lox.t/for/syntax.lox

@@ -0,0 +1,50 @@
+// Single-expression body.
+for (var c = 0; c < 3;) print c = c + 1;
+// expect: 1
+// expect: 2
+// expect: 3
+
+// Block body.
+for (var a = 0; a < 3; a = a + 1) {
+  print a;
+}
+// expect: 0
+// expect: 1
+// expect: 2
+
+// No clauses.
+fun foo() {
+  for (;;) return "done";
+}
+print foo(); // expect: done
+
+// No variable.
+var i = 0;
+for (; i < 2; i = i + 1) print i;
+// expect: 0
+// expect: 1
+
+// No condition.
+fun bar() {
+  for (var i = 0;; i = i + 1) {
+    print i;
+    if (i >= 2) return;
+  }
+}
+bar();
+// expect: 0
+// expect: 1
+// expect: 2
+
+// No increment.
+for (var i = 0; i < 2;) {
+  print i;
+  i = i + 1;
+}
+// expect: 0
+// expect: 1
+
+// Statement bodies.
+for (; false;) if (true) 1; else 2;
+for (; false;) while (true) 1;
+for (; false;) for (;;) 1;

lox.t/for/var_in_body.lox

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