Make IO a static class instead of a singleton.

test/list/add.wren

@@ -1,10 +1,10 @@
 var a = []
 a.add(1)
-io.write(a) // expect: [1]
+IO.write(a) // expect: [1]
 a.add(2)
-io.write(a) // expect: [1, 2]
+IO.write(a) // expect: [1, 2]
 a.add(3)
-io.write(a) // expect: [1, 2, 3]
+IO.write(a) // expect: [1, 2, 3]
 
 // Returns added element.
-io.write(a.add(4)) // expect: 4
+IO.write(a.add(4)) // expect: 4

test/list/clear.wren

@@ -1,7 +1,7 @@
 var a = [1, 2, 3]
 a.clear
-io.write(a)       // expect: []
-io.write(a.count) // expect: 0
+IO.write(a)       // expect: []
+IO.write(a.count) // expect: 0
 
 // Returns null.
-io.write([1, 2].clear) // expect: null
+IO.write([1, 2].clear) // expect: null

test/list/count.wren

@@ -1,3 +1,3 @@
-io.write([].count)           // expect: 0
-io.write([1].count)          // expect: 1
-io.write([1, 2, 3, 4].count) // expect: 4
+IO.write([].count)           // expect: 0
+IO.write([1].count)          // expect: 1
+IO.write([1, 2, 3, 4].count) // expect: 4

test/list/insert.wren

@@ -4,41 +4,41 @@
 // Add to empty list.
 var a = []
 a.insert(1, 0)
-io.write(a) // expect: [1]
+IO.write(a) // expect: [1]
 
 // Normal indices.
 var b = [1, 2, 3]
 b.insert(4, 0)
-io.write(b) // expect: [4, 1, 2, 3]
+IO.write(b) // expect: [4, 1, 2, 3]
 
 var c = [1, 2, 3]
 c.insert(4, 1)
-io.write(c) // expect: [1, 4, 2, 3]
+IO.write(c) // expect: [1, 4, 2, 3]
 
 var d = [1, 2, 3]
 d.insert(4, 2)
-io.write(d) // expect: [1, 2, 4, 3]
+IO.write(d) // expect: [1, 2, 4, 3]
 
 var e = [1, 2, 3]
 e.insert(4, 3)
-io.write(e) // expect: [1, 2, 3, 4]
+IO.write(e) // expect: [1, 2, 3, 4]
 
 // Negative indices.
 var f = [1, 2, 3]
 f.insert(4, -4)
-io.write(f) // expect: [4, 1, 2, 3]
+IO.write(f) // expect: [4, 1, 2, 3]
 
 var g = [1, 2, 3]
 g.insert(4, -3)
-io.write(g) // expect: [1, 4, 2, 3]
+IO.write(g) // expect: [1, 4, 2, 3]
 
 var h = [1, 2, 3]
 h.insert(4, -2)
-io.write(h) // expect: [1, 2, 4, 3]
+IO.write(h) // expect: [1, 2, 4, 3]
 
 var i = [1, 2, 3]
 i.insert(4, -1)
-io.write(i) // expect: [1, 2, 3, 4]
+IO.write(i) // expect: [1, 2, 3, 4]
 
 // Returns.inserted value.
-io.write([1, 2].insert(3, 0)) // expect: 3
+IO.write([1, 2].insert(3, 0)) // expect: 3

test/list/newlines.wren

@@ -8,7 +8,7 @@ var list = [
 
 ]
 
-io.write(list[0]) // expect: a
-io.write(list[1]) // expect: b
-io.write(list[2]) // expect: c
-io.write(list[3]) // expect: d
+IO.write(list[0]) // expect: a
+IO.write(list[1]) // expect: b
+IO.write(list[2]) // expect: c
+IO.write(list[3]) // expect: d

test/list/remove_at.wren

@@ -1,32 +1,32 @@
 var a = [1, 2, 3]
 a.removeAt(0)
-io.write(a) // expect: [2, 3]
+IO.write(a) // expect: [2, 3]
 
 var b = [1, 2, 3]
 b.removeAt(1)
-io.write(b) // expect: [1, 3]
+IO.write(b) // expect: [1, 3]
 
 var c = [1, 2, 3]
 c.removeAt(2)
-io.write(c) // expect: [1, 2]
+IO.write(c) // expect: [1, 2]
 
 // Index backwards from end.
 var d = [1, 2, 3]
 d.removeAt(-3)
-io.write(d) // expect: [2, 3]
+IO.write(d) // expect: [2, 3]
 
 var e = [1, 2, 3]
 e.removeAt(-2)
-io.write(e) // expect: [1, 3]
+IO.write(e) // expect: [1, 3]
 
 var f = [1, 2, 3]
 f.removeAt(-1)
-io.write(f) // expect: [1, 2]
+IO.write(f) // expect: [1, 2]
 
 // Out of bounds.
 // TODO: Signal error in better way.
-io.write([1, 2, 3].removeAt(3)) // expect: null
-io.write([1, 2, 3].removeAt(-4)) // expect: null
+IO.write([1, 2, 3].removeAt(3)) // expect: null
+IO.write([1, 2, 3].removeAt(-4)) // expect: null
 
 // Return the removed value.
-io.write([3, 4, 5].removeAt(1)) // expect: 4
+IO.write([3, 4, 5].removeAt(1)) // expect: 4

test/list/subscript.wren

@@ -1,25 +1,25 @@
 // Returns elements.
 var list = ["a", "b", "c", "d"]
-io.write(list[0]) // expect: a
-io.write(list[1]) // expect: b
-io.write(list[2]) // expect: c
-io.write(list[3]) // expect: d
+IO.write(list[0]) // expect: a
+IO.write(list[1]) // expect: b
+IO.write(list[2]) // expect: c
+IO.write(list[3]) // expect: d
 
 // Allows indexing backwards from the end.
-io.write(list[-4]) // expect: a
-io.write(list[-3]) // expect: b
-io.write(list[-2]) // expect: c
-io.write(list[-1]) // expect: d
+IO.write(list[-4]) // expect: a
+IO.write(list[-3]) // expect: b
+IO.write(list[-2]) // expect: c
+IO.write(list[-1]) // expect: d
 
 // Handle out of bounds.
 // TODO: Should halt the fiber or raise an error somehow.
-io.write(list[4])  // expect: null
-io.write(list[-5]) // expect: null
+IO.write(list[4])  // expect: null
+IO.write(list[-5]) // expect: null
 
 // Handle wrong argument type.
 // TODO: Should halt the fiber or raise an error somehow.
-io.write(list[true]) // expect: null
+IO.write(list[true]) // expect: null
 
 // Handle non-integer index.
 // TODO: Should halt the fiber or raise an error somehow.
-io.write(list[1.5]) // expect: null
+IO.write(list[1.5]) // expect: null

test/list/subscript_setter.wren

@@ -4,13 +4,13 @@
   list[0] = 5
   list[1] = 6
   list[2] = 7
-  io.write(list) // expect: [5, 6, 7]
+  IO.write(list) // expect: [5, 6, 7]
 }
 
 // Returns right-hand side.
 {
   var list = [1, 2, 3]
-  io.write(list[1] = 5) // expect: 5
+  IO.write(list[1] = 5) // expect: 5
 }
 
 // Negative indices.
@@ -19,7 +19,7 @@
   list[-1] = 5
   list[-2] = 6
   list[-3] = 7
-  io.write(list) // expect: [7, 6, 5]
+  IO.write(list) // expect: [7, 6, 5]
 }
 
 // TODO: Handle out of range.

test/list/type.wren

@@ -1,4 +1,4 @@
-io.write([] is List)      // expect: true
-io.write([] is Object)    // expect: true
-io.write([] is Bool)      // expect: false
-io.write([].type == List) // expect: true
+IO.write([] is List)      // expect: true
+IO.write([] is Object)    // expect: true
+IO.write([] is Bool)      // expect: false
+IO.write([].type == List) // expect: true