* lib/unholy/pyasm.rb: jump opcode and empty arrays.

lib/unholy/pyasm.rb

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

tests/07if.rb

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