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    <p>In addition to sschaef's nice solution I want to mention a few possibilities that are commonly used to get rid of commas in list construction for a DSL.</p> <h2>Colons</h2> <p>This might be trivial, but it is sometimes overlooked as a solution.</p> <pre><code>line1 :: line2 :: line3 :: Nil </code></pre> <p>For a DSL it is often desired that every line that contains some instruction/data is terminated the same way (opposed to Lists where all but the last line will get a comma). With such a solutions exchanging the lines no longer can mess up the trailing comma. Unfortunately, the <code>Nil</code> looks a bit ugly.</p> <h2>Fluid API</h2> <p>Another alternative that might be interesting for a DSL is something like that:</p> <pre><code>BuildDefinition() .line1 .line2 .line3 .build </code></pre> <p>where each line is a member function of the builder (and returns a modified builder). This solution requires to eventually convert the builder to a list (which might be done as an implicit conversion). Note that for some APIs it might be possible to pass around the builder instances themselves, and only extract the data wherever needed.</p> <h2>Constructor API</h2> <p>Similarly another possibility is to exploit constructors. </p> <pre><code>new BuildInterface { line1 line2 line3 } </code></pre> <p>Here, <code>BuildInterface</code> is a trait and we simply instantiate an anonymous class from the interface. The line functions call some member functions of this trait. Each invocation can internally update the state of the build interface. Note that this commonly results in a mutable design (but only during construction). To extract the list, an implicit conversion could be used. </p> <p>Since I don't understand the actual purpose of your DSL, I'm not really sure if any of these techniques is interesting for your scenario. I just wanted to add them since they are common ways to get rid of ",".</p>
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