More tests

testdata/arrays.monkey

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+let xs = [1, 2, 3]
+xs[0] + xs[1] + xs[2]

testdata/assign.monkey

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+let x = 1
+x = 2
+x = x + 1

testdata/builtins.monkey

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+let xs = [1, 2, 3]
+len(xs)
+
+first(xs)
+rest(xs)
+last(xs)
+push(xs, 5)
+pop(xs)
+
+len("foo")
+
+let x = input()
+print(x)

testdata/closures.monkey

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+let f = fn(x) { fn() { x + 1 } }
+f(2)

testdata/expressions.monkey

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+1 + 2;
+(1 + 2) * 3;

testdata/functions.monkey

@@ -0,0 +1,2 @@
+let f = fn(x, y) { x * y };
+f(2, 4)

testdata/hashes.monkey

@@ -0,0 +1,2 @@
+let d = {"a": 1, "b": 2}
+d["a"] + d["b"]

testdata/if.monkey

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+let x = 1
+if (x == 1) {
+  x = 2
+  x
+}

testdata/let.monkey

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+let x = 1
+let y = 2
+let z = x

testdata/strings.monkey

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+let s = "hello"
+s + " " + "world"