bind expression (:=) instead of let

testdata/arrays.monkey

@@ -1,2 +1,2 @@
-let xs = [1, 2, 3]
+xs := [1, 2, 3]
 xs[0] + xs[1] + xs[2]

testdata/assign.monkey

@@ -1,3 +1,3 @@
-let x = 1
+x := 1
 x = 2
 x = x + 1

testdata/binding.monkey

@@ -0,0 +1,3 @@
+x := 1
+y := 2
+z := x

testdata/builtins.monkey

@@ -1,4 +1,4 @@
-let xs = [1, 2, 3]
+xs := [1, 2, 3]
 len(xs)
 
 first(xs)
@@ -9,5 +9,5 @@ pop(xs)
 
 len("foo")
 
-let x = input()
+x := input()
 print(x)

testdata/closures.monkey

@@ -1,2 +1,2 @@
-let f = fn(x) { fn() { x + 1 } }
+f := fn(x) { fn() { x + 1 } }
 f(2)

testdata/functions.monkey

@@ -1,2 +1,2 @@
-let f = fn(x, y) { x * y };
+f := fn(x, y) { x * y };
 f(2, 4)

testdata/hashes.monkey

@@ -1,2 +1,2 @@
-let d = {"a": 1, "b": 2}
+d := {"a": 1, "b": 2}
 d["a"] + d["b"]

testdata/if.monkey

@@ -1,4 +1,4 @@
-let x = 1
+x := 1
 if (x == 1) {
   x = 2
   x

testdata/let.monkey

@@ -1,3 +0,0 @@
-let x = 1
-let y = 2
-let z = x

testdata/popbug1.monkey

@@ -1 +0,0 @@
-let n = 2; let x = 0; while (n > 0) { if (n > 1) { x = x + 1 }; n = n - 1; }; x;

testdata/popbug2.monkey

@@ -1 +0,0 @@
-let n = 2; let x = 0; while (n > 0) { if (n > 1) { x = x + 1 }; let n = n - 1; }; x;

testdata/popbug3.monkey

@@ -1 +0,0 @@
-let x = 1; if (x == 1) { let x = 2 }

testdata/selectors.monkey

@@ -0,0 +1,5 @@
+d := {"foo": 1, "bar": 2}
+
+assert(d.foo == 1, "d.foo != 1")
+assert(d.bar == 2, "d.bar != 2")
+assert(d.bogus == null, "d.bogus != null")

testdata/strings.monkey

@@ -1,2 +1,2 @@
-let s = "hello"
+s := "hello"
 s + " " + "world"