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@@ -411,6 +411,7 @@ END
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     def parse_mixin_include(line, root)
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       name, arg_string = line.text.scan(/^\+\s*([^(]+)(.*)$/).first
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+      name.strip!
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       args = parse_mixin_arguments(arg_string)
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       raise SyntaxError.new("Illegal nesting: Nothing may be nested beneath mixin directives.", @line + 1) unless line.children.empty?
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       raise SyntaxError.new("Invalid mixin include \"#{line.text}\".", @line) if name.nil? || args.nil?

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@@ -355,6 +355,14 @@ SASS
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 blat
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   +foo(\"hi\")
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 SASS
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+
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+    assert_equal("blat {\n  baz: hi; }\n", render(<<SASS))
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+=foo(!bar)
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+  baz = !bar
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+blat
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+  +foo    (\"hi\")
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+SASS
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+
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     assert_equal("blat {\n  baz: 3; }\n", render(<<SASS))
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 =foo(!a, !b)
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   baz = !a + !b