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@@ -81,7 +81,7 @@ class Pyasm
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     bc(0x66, n, 0x0)
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   end
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   def build_list(n)
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-    @stack.slice! -(n-1), (n-1)
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+    @stack.slice! -(n-1), (n-1) if n > 0
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     bc(0x67, n, 0x0)
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   end
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   def load_attr(name)
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@@ -96,6 +96,9 @@ class Pyasm
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   def import_from(name)
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     bc 0x6c, add_sym(name), 0x0
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   end
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+  def jump(n)
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+    mark_jump n, bc(0x6e, n, 0x0)
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+  end
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   def jump_if_false(n)
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     mark_jump n, bc(0x6f, n, 0x0)
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   end

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@@ -0,0 +1,27 @@
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+# 123
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+# 123
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+# 456
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+# 123
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+a = []
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+if true
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+  a << 123
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+end
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+puts a[0]
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+
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+a = []
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+if true
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+  a << 123
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+else
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+  a << 456
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+end
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+puts a[0]
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+
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+a = []
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+if false
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+  a << 123
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+else
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+  a << 456
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+end
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+puts a[0]
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+
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+puts 123 if true