Demo changes

testdata/popbug1.monkey

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

testdata/popbug2.monkey

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

testdata/popbug3.monkey

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