Use more conventional syntax for constructors.

They are now invoked like "new Foo".
Also, superclass constructors are now much less semantically
and syntactically weird. Since the instance is created before
any constructor is called, there's no point in time where the
instance isn't there.

test/constructor/default.wren

@@ -3,7 +3,7 @@ class Foo {
 }
 
 // A class with no constructors gets an argument-less "new" one by default.
-var foo = Foo.new
+var foo = new Foo
 io.write(foo is Foo) // expect: true
 io.write(foo.toString) // expect: Foo
 

test/constructor/named.wren

@@ -1,20 +0,0 @@
-class Foo {
-  this bar { io.write("this bar") }
-  this baz { io.write("this baz") }
-  this bar(arg) { io.write("this bar " + arg) }
-
-  toString { return "Foo" }
-}
-
-// Different names.
-Foo.bar // expect: this bar
-Foo.baz // expect: this baz
-
-// Can overload by arity.
-Foo.bar // expect: this bar
-Foo.bar("one") // expect: this bar one
-
-// Returns the new instance.
-var foo = Foo.bar // expect: this bar
-io.write(foo is Foo) // expect: true
-io.write(foo.toString) // expect: Foo

test/constructor/new.wren

@@ -1,18 +1,17 @@
 class Foo {
-  // TODO: Do we want to require an explicit "new" here?
-  this new { io.write("zero") }
-  this new(a) { io.write(a) }
-  this new(a, b) { io.write(a + b) }
+  new { io.write("zero") }
+  new(a) { io.write(a) }
+  new(a, b) { io.write(a + b) }
 
   toString { return "Foo" }
 }
 
 // Can overload by arity.
-Foo.new // expect: zero
-Foo.new("one") // expect: one
-Foo.new("one", "two") // expect: onetwo
+new Foo // expect: zero
+new Foo("one") // expect: one
+new Foo("one", "two") // expect: onetwo
 
 // Returns the new instance.
-var foo = Foo.new // expect: zero
+var foo = new Foo // expect: zero
 io.write(foo is Foo) // expect: true
 io.write(foo.toString) // expect: Foo

test/constructor/superclass.wren

@@ -1,6 +1,6 @@
 class A {
-  this new(arg) {
-    io.write("A.new " + arg)
+  new(arg) {
+    io.write("new A " + arg)
     _field = arg
   }
 
@@ -8,8 +8,9 @@ class A {
 }
 
 class B is A {
-  this otherName(arg1, arg2) super.new(arg2) {
-    io.write("B.otherName " + arg1)
+  new(arg1, arg2) {
+    super(arg2)
+    io.write("new B " + arg1)
     _field = arg1
   }
 
@@ -17,18 +18,19 @@ class B is A {
 }
 
 class C is B {
-  this create super.otherName("one", "two") {
-    io.write("C.create")
+  new {
+    super("one", "two")
+    io.write("new C")
     _field = "c"
   }
 
   cField { return _field }
 }
 
-var c = C.create
-// expect: A.new two
-// expect: B.otherName one
-// expect: C.create
+var c = new C
+// expect: new A two
+// expect: new B one
+// expect: new C
 io.write(c is A) // expect: true
 io.write(c is B) // expect: true
 io.write(c is C) // expect: true