added tests

interpreter/Cargo.toml

@@ -8,7 +8,10 @@ edition = "2021"
 [dependencies.rlox2-frontend]
 path = "../frontend"
 
+[dev-dependencies]
+glob = "0.3"
+
 [dependencies]
-thiserror = "1.0.38"
-itertools = "0.10.5"
-rustc-hash = "1.1.0"
+thiserror = "1"
+itertools = "0.13"
+rustc-hash = "2"

interpreter/tests/lox/assignment/associativity.lox

@@ -0,0 +1,9 @@
+var a = "a";
+var b = "b";
+var c = "c";
+
+// Assignment is right-associative.
+a = b = c;
+print a; // expect: c
+print b; // expect: c
+print c; // expect: c

interpreter/tests/lox/assignment/global.lox

@@ -0,0 +1,8 @@
+var a = "before";
+print a; // expect: before
+
+a = "after";
+print a; // expect: after
+
+print a = "arg"; // expect: arg
+print a; // expect: arg

interpreter/tests/lox/assignment/grouping.lox

@@ -0,0 +1,2 @@
+var a = "a";
+(a) = "value"; // Error at '=': Invalid assignment target.

interpreter/tests/lox/assignment/infix_operator.lox

@@ -0,0 +1,3 @@
+var a = "a";
+var b = "b";
+a + b = "value"; // Error at '=': Invalid assignment target.

interpreter/tests/lox/assignment/local.lox

@@ -0,0 +1,10 @@
+{
+  var a = "before";
+  print a; // expect: before
+
+  a = "after";
+  print a; // expect: after
+
+  print a = "arg"; // expect: arg
+  print a; // expect: arg
+}

interpreter/tests/lox/assignment/prefix_operator.lox

@@ -0,0 +1,2 @@
+var a = "a";
+!a = "value"; // Error at '=': Invalid assignment target.

interpreter/tests/lox/assignment/syntax.lox

@@ -0,0 +1,5 @@
+// Assignment on RHS of variable.
+var a = "before";
+var c = a = "var";
+print a; // expect: var
+print c; // expect: var

interpreter/tests/lox/assignment/to_this.lox

@@ -0,0 +1,7 @@
+class Foo {
+  Foo() {
+    this = "value"; // Error at '=': Invalid assignment target.
+  }
+}
+
+Foo();

interpreter/tests/lox/assignment/undefined.lox

@@ -0,0 +1 @@
+unknown = "what"; // Error: Undefined variable 'unknown'.

interpreter/tests/lox/block/empty.lox

@@ -0,0 +1,7 @@
+{} // By itself.
+
+// In a statement.
+if (true) {}
+if (false) {} else {}
+
+print "ok"; // expect: ok

interpreter/tests/lox/block/scope.lox

@@ -0,0 +1,8 @@
+var a = "outer";
+
+{
+  var a = "inner";
+  print a; // expect: inner
+}
+
+print a; // expect: outer

interpreter/tests/lox/bool/equality.lox

@@ -0,0 +1,23 @@
+print true == true;    // expect: true
+print true == false;   // expect: false
+print false == true;   // expect: false
+print false == false;  // expect: true
+
+// Not equal to other types.
+print true == 1;        // expect: false
+print false == 0;       // expect: false
+print true == "true";   // expect: false
+print false == "false"; // expect: false
+print false == "";      // expect: false
+
+print true != true;    // expect: false
+print true != false;   // expect: true
+print false != true;   // expect: true
+print false != false;  // expect: false
+
+// Not equal to other types.
+print true != 1;        // expect: true
+print false != 0;       // expect: true
+print true != "true";   // expect: true
+print false != "false"; // expect: true
+print false != "";      // expect: true

interpreter/tests/lox/bool/not.lox

@@ -0,0 +1,3 @@
+print !true;    // expect: false
+print !false;   // expect: true
+print !!true;   // expect: true

interpreter/tests/lox/break/for.lox

@@ -0,0 +1,11 @@
+for (var i = 0; i < 10; i = i + 1) {
+    if (i == 5)
+        break;
+    
+    print i;
+}
+// expect: 0
+// expect: 1
+// expect: 2
+// expect: 3
+// expect: 4

interpreter/tests/lox/break/outside_loop.lox

@@ -0,0 +1,2 @@
+break;
+// expect: error

interpreter/tests/lox/break/while.lox

@@ -0,0 +1,15 @@
+var i = 0;
+
+while (i < 10) {    
+    if (i == 5)
+        break;
+    
+    print i;
+    
+    i = i + 1;
+}
+// expect: 0
+// expect: 1
+// expect: 2
+// expect: 3
+// expect: 4

interpreter/tests/lox/call/bool.lox

@@ -0,0 +1 @@
+true(); // expect runtime error: Can only call functions and classes.

interpreter/tests/lox/call/nil.lox

@@ -0,0 +1 @@
+nil(); // expect runtime error: Can only call functions and classes.

interpreter/tests/lox/call/num.lox

@@ -0,0 +1 @@
+123(); // expect runtime error: Can only call functions and classes.

interpreter/tests/lox/call/object.lox

@@ -0,0 +1,4 @@
+class Foo {}
+
+var foo = Foo();
+foo(); // expect runtime error: Can only call functions and classes.

interpreter/tests/lox/call/string.lox

@@ -0,0 +1 @@
+"str"(); // expect runtime error: Can only call functions and classes.

interpreter/tests/lox/class/empty.lox

@@ -0,0 +1,3 @@
+class Foo {}
+
+print Foo; // expect: Foo

interpreter/tests/lox/class/inherit_self.lox

@@ -0,0 +1 @@
+class Foo < Foo {} // Error at 'Foo': A class can't inherit from itself.

interpreter/tests/lox/class/inherited_method.lox

@@ -0,0 +1,22 @@
+class Foo {
+  inFoo() {
+    print "in foo";
+  }
+}
+
+class Bar < Foo {
+  inBar() {
+    print "in bar";
+  }
+}
+
+class Baz < Bar {
+  inBaz() {
+    print "in baz";
+  }
+}
+
+var baz = Baz();
+baz.inFoo(); // expect: in foo
+baz.inBar(); // expect: in bar
+baz.inBaz(); // expect: in baz

interpreter/tests/lox/class/local_inherit_other.lox

@@ -0,0 +1,8 @@
+class A {}
+
+fun f() {
+  class B < A {}
+  return B;
+}
+
+print f(); // expect: B

interpreter/tests/lox/class/local_inherit_self.lox

@@ -0,0 +1,4 @@
+{
+  class Foo < Foo {} // Error at 'Foo': A class can't inherit from itself.
+}
+// [c line 5] Error at end: Expect '}' after block.

interpreter/tests/lox/class/local_reference_self.lox

@@ -0,0 +1,9 @@
+{
+  class Foo {
+    returnSelf() {
+      return Foo;
+    }
+  }
+
+  print Foo().returnSelf(); // expect: Foo
+}

interpreter/tests/lox/class/reference_self.lox

@@ -0,0 +1,7 @@
+class Foo {
+  returnSelf() {
+    return Foo;
+  }
+}
+
+print Foo().returnSelf(); // expect: Foo

interpreter/tests/lox/closure/assign_to_closure.lox

@@ -0,0 +1,27 @@
+var f;
+var g;
+
+{
+  var local = "local";
+  fun f_() {
+    print local;
+    local = "after f";
+    print local;
+  }
+  f = f_;
+
+  fun g_() {
+    print local;
+    local = "after g";
+    print local;
+  }
+  g = g_;
+}
+
+f();
+// expect: local
+// expect: after f
+
+g();
+// expect: after f
+// expect: after g

interpreter/tests/lox/closure/assign_to_shadowed_later.lox

@@ -0,0 +1,13 @@
+var a = "global";
+
+{
+  fun assign() {
+    a = "assigned";
+  }
+
+  var a = "inner";
+  assign();
+  print a; // expect: inner
+}
+
+print a; // expect: assigned

interpreter/tests/lox/closure/close_over_function_parameter.lox

@@ -0,0 +1,11 @@
+var f;
+
+fun foo(param) {
+  fun f_() {
+    print param;
+  }
+  f = f_;
+}
+foo("param");
+
+f(); // expect: param

interpreter/tests/lox/closure/close_over_later_variable.lox

@@ -0,0 +1,15 @@
+// This is a regression test. There was a bug where if an upvalue for an
+// earlier local (here "a") was captured *after* a later one ("b"), then it
+// would crash because it walked to the end of the upvalue list (correct), but
+// then didn't handle not finding the variable.
+
+fun f() {
+  var a = "a";
+  var b = "b";
+  fun g() {
+    print b; // expect: b
+    print a; // expect: a
+  }
+  g();
+}
+f();

interpreter/tests/lox/closure/close_over_method_parameter.lox

@@ -0,0 +1,13 @@
+var f;
+
+class Foo {
+  method(param) {
+    fun f_() {
+      print param;
+    }
+    f = f_;
+  }
+}
+
+Foo().method("param");
+f(); // expect: param

interpreter/tests/lox/closure/closed_closure_in_function.lox

@@ -0,0 +1,11 @@
+var f;
+
+{
+  var local = "local";
+  fun f_() {
+    print local;
+  }
+  f = f_;
+}
+
+f(); // expect: local

interpreter/tests/lox/closure/nested_closure.lox

@@ -0,0 +1,25 @@
+var f;
+
+fun f1() {
+  var a = "a";
+  fun f2() {
+    var b = "b";
+    fun f3() {
+      var c = "c";
+      fun f4() {
+        print a;
+        print b;
+        print c;
+      }
+      f = f4;
+    }
+    f3();
+  }
+  f2();
+}
+f1();
+
+f();
+// expect: a
+// expect: b
+// expect: c

interpreter/tests/lox/closure/open_closure_in_function.lox

@@ -0,0 +1,7 @@
+{
+  var local = "local";
+  fun f() {
+    print local; // expect: local
+  }
+  f();
+}

interpreter/tests/lox/closure/reference_closure_multiple_times.lox

@@ -0,0 +1,14 @@
+var f;
+
+{
+  var a = "a";
+  fun f_() {
+    print a;
+    print a;
+  }
+  f = f_;
+}
+
+f();
+// expect: a
+// expect: a

interpreter/tests/lox/closure/reuse_closure_slot.lox

@@ -0,0 +1,16 @@
+{
+  var f;
+
+  {
+    var a = "a";
+    fun f_() { print a; }
+    f = f_;
+  }
+
+  {
+    // Since a is out of scope, the local slot will be reused by b. Make sure
+    // that f still closes over a.
+    var b = "b";
+    f(); // expect: a
+  }
+}

interpreter/tests/lox/closure/shadow_closure_with_local.lox

@@ -0,0 +1,12 @@
+{
+  var foo = "closure";
+  fun f() {
+    {
+      print foo; // expect: closure
+      var foo = "shadow";
+      print foo; // expect: shadow
+    }
+    print foo; // expect: closure
+  }
+  f();
+}

interpreter/tests/lox/closure/unused_closure.lox

@@ -0,0 +1,13 @@
+// This is a regression test. There was a bug where the VM would try to close
+// an upvalue even if the upvalue was never created because the codepath for
+// the closure was not executed.
+
+{
+  var a = "a";
+  if (false) {
+    fun foo() { a; }
+  }
+}
+
+// If we get here, we didn't segfault when a went out of scope.
+print "ok"; // expect: ok

interpreter/tests/lox/closure/unused_later_closure.lox

@@ -0,0 +1,28 @@
+// This is a regression test. When closing upvalues for discarded locals, it
+// wouldn't make sure it discarded the upvalue for the correct stack slot.
+//
+// Here we create two locals that can be closed over, but only the first one
+// actually is. When "b" goes out of scope, we need to make sure we don't
+// prematurely close "a".
+var closure;
+
+{
+  var a = "a";
+
+  {
+    var b = "b";
+    fun returnA() {
+      return a;
+    }
+
+    closure = returnA;
+
+    if (false) {
+      fun returnB() {
+        return b;
+      }
+    }
+  }
+
+  print closure(); // expect: a
+}

interpreter/tests/lox/comments/line_at_eof.lox

@@ -0,0 +1,2 @@
+print "ok"; // expect: ok
+// comment

interpreter/tests/lox/comments/only_line_comment.lox

@@ -0,0 +1 @@
+// comment

interpreter/tests/lox/comments/only_line_comment_and_line.lox

@@ -0,0 +1 @@
+// comment

interpreter/tests/lox/comments/unicode.lox

@@ -0,0 +1,9 @@
+// Unicode characters are allowed in comments.
+//
+// Latin 1 Supplement: £§¶ÜÞ
+// Latin Extended-A: ĐĦŋœ
+// Latin Extended-B: ƂƢƩǁ
+// Other stuff: ឃᢆ᯽₪ℜ↩⊗┺░
+// Emoji: ☃☺♣
+
+print "ok"; // expect: ok

interpreter/tests/lox/constructor/arguments.lox

@@ -0,0 +1,11 @@
+class Foo {
+  init(a, b) {
+    print "init"; // expect: init
+    this.a = a;
+    this.b = b;
+  }
+}
+
+var foo = Foo(1, 2);
+print foo.a; // expect: 1
+print foo.b; // expect: 2

interpreter/tests/lox/constructor/call_init_early_return.lox

@@ -0,0 +1,11 @@
+class Foo {
+  init() {
+    print "init";
+    return;
+    print "nope";
+  }
+}
+
+var foo = Foo(); // expect: init
+print foo.init(); // expect: init
+// expect: Foo instance

interpreter/tests/lox/constructor/call_init_explicitly.lox

@@ -0,0 +1,15 @@
+class Foo {
+  init(arg) {
+    print "Foo.init(" + arg + ")";
+    this.field = "init";
+  }
+}
+
+var foo = Foo("one"); // expect: Foo.init(one)
+foo.field = "field";
+
+var foo2 = foo.init("two"); // expect: Foo.init(two)
+print foo2; // expect: Foo instance
+
+// Make sure init() doesn't create a fresh instance.
+print foo.field; // expect: init

interpreter/tests/lox/constructor/default.lox

@@ -0,0 +1,4 @@
+class Foo {}
+
+var foo = Foo();
+print foo; // expect: Foo instance

interpreter/tests/lox/constructor/default_arguments.lox

@@ -0,0 +1,3 @@
+class Foo {}
+
+var foo = Foo(1, 2, 3); // expect runtime error: Expected 0 arguments but got 3.

interpreter/tests/lox/constructor/early_return.lox

@@ -0,0 +1,10 @@
+class Foo {
+  init() {
+    print "init";
+    return;
+    print "nope";
+  }
+}
+
+var foo = Foo(); // expect: init
+print foo; // expect: Foo instance

interpreter/tests/lox/constructor/extra_arguments.lox

@@ -0,0 +1,8 @@
+class Foo {
+  init(a, b) {
+    this.a = a;
+    this.b = b;
+  }
+}
+
+var foo = Foo(1, 2, 3, 4); // expect runtime error: Expected 2 arguments but got 4.

interpreter/tests/lox/constructor/init_not_method.lox

@@ -0,0 +1,12 @@
+class Foo {
+  init(arg) {
+    print "Foo.init(" + arg + ")";
+    this.field = "init";
+  }
+}
+
+fun init() {
+  print "not initializer";
+}
+
+init(); // expect: not initializer

interpreter/tests/lox/constructor/missing_arguments.lox

@@ -0,0 +1,5 @@
+class Foo {
+  init(a, b) {}
+}
+
+var foo = Foo(1); // expect runtime error: Expected 2 arguments but got 1.

interpreter/tests/lox/constructor/return_in_nested_function.lox

@@ -0,0 +1,10 @@
+class Foo {
+  init() {
+    fun init() {
+      return "bar";
+    }
+    print init(); // expect: bar
+  }
+}
+
+print Foo(); // expect: Foo instance

interpreter/tests/lox/constructor/return_value.lox

@@ -0,0 +1,5 @@
+class Foo {
+  init() {
+    return "result"; // Error at 'return': Can't return a value from an initializer.
+  }
+}

interpreter/tests/lox/continue/for.lox

@@ -0,0 +1,16 @@
+for (var i = 0; i < 10; i = i + 1) {
+    if (i == 5)
+        continue;
+
+    print i;
+}
+// expect: 0
+// expect: 1
+// expect: 2
+// expect: 3
+// expect: 4
+// expect: 6
+// expect: 7
+// expect: 8
+// expect: 9
+

interpreter/tests/lox/continue/outside_loop.lox

@@ -0,0 +1,2 @@
+continue;
+// expect: error

interpreter/tests/lox/continue/while.lox

@@ -0,0 +1,21 @@
+var i = 0;
+
+while (i < 10) {    
+    if (i == 5) {
+        i = i + 1;
+        continue;
+    }
+
+    print i;
+    
+    i = i + 1;
+}
+// expect: 0
+// expect: 1
+// expect: 2
+// expect: 3
+// expect: 4
+// expect: 6
+// expect: 7
+// expect: 8
+// expect: 9

interpreter/tests/lox/field/call_function_field.lox

@@ -0,0 +1,15 @@
+class Foo {}
+
+fun bar(a, b) {
+  print "bar";
+  print a;
+  print b;
+}
+
+var foo = Foo();
+foo.bar = bar;
+
+foo.bar(1, 2);
+// expect: bar
+// expect: 1
+// expect: 2

interpreter/tests/lox/field/call_nonfunction_field.lox

@@ -0,0 +1,6 @@
+class Foo {}
+
+var foo = Foo();
+foo.bar = "not fn";
+
+foo.bar(); // expect runtime error: Can only call functions and classes.

interpreter/tests/lox/field/get_and_set_method.lox

@@ -0,0 +1,25 @@
+// Bound methods have identity equality.
+class Foo {
+  method(a) {
+    print "method";
+    print a;
+  }
+  other(a) {
+    print "other";
+    print a;
+  }
+}
+
+var foo = Foo();
+var method = foo.method;
+
+// Setting a property shadows the instance method.
+foo.method = foo.other;
+foo.method(1);
+// expect: other
+// expect: 1
+
+// The old method handle still points to the original method.
+method(2);
+// expect: method
+// expect: 2

interpreter/tests/lox/field/get_on_bool.lox

@@ -0,0 +1 @@
+true.foo; // expect runtime error: Only instances have properties.

interpreter/tests/lox/field/get_on_class.lox

@@ -0,0 +1,2 @@
+class Foo {}
+Foo.bar; // expect runtime error: Only instances have properties.

interpreter/tests/lox/field/get_on_function.lox

@@ -0,0 +1,3 @@
+fun foo() {}
+
+foo.bar; // expect runtime error: Only instances have properties.

interpreter/tests/lox/field/get_on_nil.lox

@@ -0,0 +1 @@
+nil.foo; // expect runtime error: Only instances have properties.

interpreter/tests/lox/field/get_on_num.lox

@@ -0,0 +1 @@
+123.foo; // expect runtime error: Only instances have properties.

interpreter/tests/lox/field/get_on_string.lox

@@ -0,0 +1 @@
+"str".foo; // expect runtime error: Only instances have properties.

interpreter/tests/lox/field/many.lox

@@ -0,0 +1,170 @@
+class Foo {}
+
+var foo = Foo();
+fun setFields() {
+  foo.bilberry = "bilberry";
+  foo.lime = "lime";
+  foo.elderberry = "elderberry";
+  foo.raspberry = "raspberry";
+  foo.gooseberry = "gooseberry";
+  foo.longan = "longan";
+  foo.mandarine = "mandarine";
+  foo.kiwifruit = "kiwifruit";
+  foo.orange = "orange";
+  foo.pomegranate = "pomegranate";
+  foo.tomato = "tomato";
+  foo.banana = "banana";
+  foo.juniper = "juniper";
+  foo.damson = "damson";
+  foo.blackcurrant = "blackcurrant";
+  foo.peach = "peach";
+  foo.grape = "grape";
+  foo.mango = "mango";
+  foo.redcurrant = "redcurrant";
+  foo.watermelon = "watermelon";
+  foo.plumcot = "plumcot";
+  foo.papaya = "papaya";
+  foo.cloudberry = "cloudberry";
+  foo.rambutan = "rambutan";
+  foo.salak = "salak";
+  foo.physalis = "physalis";
+  foo.huckleberry = "huckleberry";
+  foo.coconut = "coconut";
+  foo.date = "date";
+  foo.tamarind = "tamarind";
+  foo.lychee = "lychee";
+  foo.raisin = "raisin";
+  foo.apple = "apple";
+  foo.avocado = "avocado";
+  foo.nectarine = "nectarine";
+  foo.pomelo = "pomelo";
+  foo.melon = "melon";
+  foo.currant = "currant";
+  foo.plum = "plum";
+  foo.persimmon = "persimmon";
+  foo.olive = "olive";
+  foo.cranberry = "cranberry";
+  foo.boysenberry = "boysenberry";
+  foo.blackberry = "blackberry";
+  foo.passionfruit = "passionfruit";
+  foo.mulberry = "mulberry";
+  foo.marionberry = "marionberry";
+  foo.plantain = "plantain";
+  foo.lemon = "lemon";
+  foo.yuzu = "yuzu";
+  foo.loquat = "loquat";
+  foo.kumquat = "kumquat";
+  foo.salmonberry = "salmonberry";
+  foo.tangerine = "tangerine";
+  foo.durian = "durian";
+  foo.pear = "pear";
+  foo.cantaloupe = "cantaloupe";
+  foo.quince = "quince";
+  foo.guava = "guava";
+  foo.strawberry = "strawberry";
+  foo.nance = "nance";
+  foo.apricot = "apricot";
+  foo.jambul = "jambul";
+  foo.grapefruit = "grapefruit";
+  foo.clementine = "clementine";
+  foo.jujube = "jujube";
+  foo.cherry = "cherry";
+  foo.feijoa = "feijoa";
+  foo.jackfruit = "jackfruit";
+  foo.fig = "fig";
+  foo.cherimoya = "cherimoya";
+  foo.pineapple = "pineapple";
+  foo.blueberry = "blueberry";
+  foo.jabuticaba = "jabuticaba";
+  foo.miracle = "miracle";
+  foo.dragonfruit = "dragonfruit";
+  foo.satsuma = "satsuma";
+  foo.tamarillo = "tamarillo";
+  foo.honeydew = "honeydew";
+}
+
+setFields();
+
+fun printFields() {
+  print foo.apple; // expect: apple
+  print foo.apricot; // expect: apricot
+  print foo.avocado; // expect: avocado
+  print foo.banana; // expect: banana
+  print foo.bilberry; // expect: bilberry
+  print foo.blackberry; // expect: blackberry
+  print foo.blackcurrant; // expect: blackcurrant
+  print foo.blueberry; // expect: blueberry
+  print foo.boysenberry; // expect: boysenberry
+  print foo.cantaloupe; // expect: cantaloupe
+  print foo.cherimoya; // expect: cherimoya
+  print foo.cherry; // expect: cherry
+  print foo.clementine; // expect: clementine
+  print foo.cloudberry; // expect: cloudberry
+  print foo.coconut; // expect: coconut
+  print foo.cranberry; // expect: cranberry
+  print foo.currant; // expect: currant
+  print foo.damson; // expect: damson
+  print foo.date; // expect: date
+  print foo.dragonfruit; // expect: dragonfruit
+  print foo.durian; // expect: durian
+  print foo.elderberry; // expect: elderberry
+  print foo.feijoa; // expect: feijoa
+  print foo.fig; // expect: fig
+  print foo.gooseberry; // expect: gooseberry
+  print foo.grape; // expect: grape
+  print foo.grapefruit; // expect: grapefruit
+  print foo.guava; // expect: guava
+  print foo.honeydew; // expect: honeydew
+  print foo.huckleberry; // expect: huckleberry
+  print foo.jabuticaba; // expect: jabuticaba
+  print foo.jackfruit; // expect: jackfruit
+  print foo.jambul; // expect: jambul
+  print foo.jujube; // expect: jujube
+  print foo.juniper; // expect: juniper
+  print foo.kiwifruit; // expect: kiwifruit
+  print foo.kumquat; // expect: kumquat
+  print foo.lemon; // expect: lemon
+  print foo.lime; // expect: lime
+  print foo.longan; // expect: longan
+  print foo.loquat; // expect: loquat
+  print foo.lychee; // expect: lychee
+  print foo.mandarine; // expect: mandarine
+  print foo.mango; // expect: mango
+  print foo.marionberry; // expect: marionberry
+  print foo.melon; // expect: melon
+  print foo.miracle; // expect: miracle
+  print foo.mulberry; // expect: mulberry
+  print foo.nance; // expect: nance
+  print foo.nectarine; // expect: nectarine
+  print foo.olive; // expect: olive
+  print foo.orange; // expect: orange
+  print foo.papaya; // expect: papaya
+  print foo.passionfruit; // expect: passionfruit
+  print foo.peach; // expect: peach
+  print foo.pear; // expect: pear
+  print foo.persimmon; // expect: persimmon
+  print foo.physalis; // expect: physalis
+  print foo.pineapple; // expect: pineapple
+  print foo.plantain; // expect: plantain
+  print foo.plum; // expect: plum
+  print foo.plumcot; // expect: plumcot
+  print foo.pomegranate; // expect: pomegranate
+  print foo.pomelo; // expect: pomelo
+  print foo.quince; // expect: quince
+  print foo.raisin; // expect: raisin
+  print foo.rambutan; // expect: rambutan
+  print foo.raspberry; // expect: raspberry
+  print foo.redcurrant; // expect: redcurrant
+  print foo.salak; // expect: salak
+  print foo.salmonberry; // expect: salmonberry
+  print foo.satsuma; // expect: satsuma
+  print foo.strawberry; // expect: strawberry
+  print foo.tamarillo; // expect: tamarillo
+  print foo.tamarind; // expect: tamarind
+  print foo.tangerine; // expect: tangerine
+  print foo.tomato; // expect: tomato
+  print foo.watermelon; // expect: watermelon
+  print foo.yuzu; // expect: yuzu
+}
+
+printFields();

interpreter/tests/lox/field/method.lox

@@ -0,0 +1,9 @@
+class Foo {
+  bar(arg) {
+    print arg;
+  }
+}
+
+var bar = Foo().bar;
+print "got method"; // expect: got method
+bar("arg");          // expect: arg

interpreter/tests/lox/field/method_binds_this.lox

@@ -0,0 +1,19 @@
+class Foo {
+  sayName(a) {
+    print this.name;
+    print a;
+  }
+}
+
+var foo1 = Foo();
+foo1.name = "foo1";
+
+var foo2 = Foo();
+foo2.name = "foo2";
+
+// Store the method reference on another object.
+foo2.fn = foo1.sayName;
+// Still retains original receiver.
+foo2.fn(1);
+// expect: foo1
+// expect: 1

interpreter/tests/lox/field/on_instance.lox

@@ -0,0 +1,9 @@
+class Foo {}
+
+var foo = Foo();
+
+print foo.bar = "bar value"; // expect: bar value
+print foo.baz = "baz value"; // expect: baz value
+
+print foo.bar; // expect: bar value
+print foo.baz; // expect: baz value

interpreter/tests/lox/field/set_evaluation_order.lox

@@ -0,0 +1,2 @@
+undefined1.bar // expect runtime error: Undefined variable 'undefined1'.
+  = undefined2;

interpreter/tests/lox/field/set_on_bool.lox

@@ -0,0 +1 @@
+true.foo = "value"; // expect runtime error: Only instances have fields.

interpreter/tests/lox/field/set_on_class.lox

@@ -0,0 +1,2 @@
+class Foo {}
+Foo.bar = "value"; // expect runtime error: Only instances have fields.

interpreter/tests/lox/field/set_on_function.lox

@@ -0,0 +1,3 @@
+fun foo() {}
+
+foo.bar = "value"; // expect runtime error: Only instances have fields.

interpreter/tests/lox/field/set_on_nil.lox

@@ -0,0 +1 @@
+nil.foo = "value"; // expect runtime error: Only instances have fields.

interpreter/tests/lox/field/set_on_num.lox

@@ -0,0 +1 @@
+123.foo = "value"; // expect runtime error: Only instances have fields.

interpreter/tests/lox/field/set_on_string.lox

@@ -0,0 +1 @@
+"str".foo = "value"; // expect runtime error: Only instances have fields.

interpreter/tests/lox/field/undefined.lox

@@ -0,0 +1,4 @@
+class Foo {}
+var foo = Foo();
+
+foo.bar; // expect runtime error: Undefined property 'bar'.

interpreter/tests/lox/for/class_in_body.lox

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

interpreter/tests/lox/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

interpreter/tests/lox/for/fun_in_body.lox

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

interpreter/tests/lox/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

interpreter/tests/lox/for/return_inside.lox

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

interpreter/tests/lox/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
+  }
+}

interpreter/tests/lox/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) {}

interpreter/tests/lox/for/statement_increment.lox

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

interpreter/tests/lox/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) {}

interpreter/tests/lox/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;

interpreter/tests/lox/for/var_in_body.lox

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

interpreter/tests/lox/function/body_must_be_block.lox

@@ -0,0 +1,3 @@
+// [line 3] Error at '123': Expect '{' before function body.
+// [c line 4] Error at end: Expect '}' after block.
+fun f() 123;

interpreter/tests/lox/function/empty_body.lox

@@ -0,0 +1,2 @@
+fun f() {}
+print f(); // expect: nil

interpreter/tests/lox/function/extra_arguments.lox

@@ -0,0 +1,6 @@
+fun f(a, b) {
+  print a;
+  print b;
+}
+
+f(1, 2, 3, 4); // expect runtime error: Expected 2 arguments but got 4.

interpreter/tests/lox/function/local_mutual_recursion.lox

@@ -0,0 +1,13 @@
+{
+  fun isEven(n) {
+    if (n == 0) return true;
+    return isOdd(n - 1); // expect runtime error: Undefined variable 'isOdd'.
+  }
+
+  fun isOdd(n) {
+    if (n == 0) return false;
+    return isEven(n - 1);
+  }
+
+  isEven(4);
+}

interpreter/tests/lox/function/local_recursion.lox

@@ -0,0 +1,8 @@
+{
+  fun fib(n) {
+    if (n < 2) return n;
+    return fib(n - 1) + fib(n - 2);
+  }
+
+  print fib(8); // expect: 21
+}

interpreter/tests/lox/function/missing_arguments.lox

@@ -0,0 +1,3 @@
+fun f(a, b) {}
+
+f(1); // expect runtime error: Expected 2 arguments but got 1.

interpreter/tests/lox/function/missing_comma_in_parameters.lox

@@ -0,0 +1,3 @@
+// [line 3] Error at 'c': Expect ')' after parameters.
+// [c line 4] Error at end: Expect '}' after block.
+fun foo(a, b c, d, e, f) {}