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copied!<p>Yes, you can, on Scala 2.8. Note that, for this to work, you have to include the scala-compiler.jar in your classpath. If you invoke your scala program with <code>scala</code>, it will be done automatically (or so it seems in the tests I made).</p> <p>You can then use it like this:</p> <pre><code>import scala.tools.nsc.Interpreter._ object TestDebugger { def main(args: Array[String]) { 0 to 10 foreach { i => breakIf(i == 5, DebugParam("i", i)) println(i) } } } </code></pre> <p>You may pass multiple <code>DebugParam</code> arguments. When the REPL comes up, the value on the right will be bound to a val whose name you provided on the left. For instance, if I change that line like this:</p> <pre><code> breakIf(i == 5, DebugParam("j", i)) </code></pre> <p>Then the execution will happen like this:</p> <pre><code>C:\Users\Daniel\Documents\Scala\Programas>scala TestDebugger 0 1 2 3 4 j: Int scala> j res0: Int = 5 </code></pre> <p>You continue the execution by typing <code>:quit</code>.</p> <p>You may also unconditionally drop into REPL by invoking <code>break</code>, which receives a <code>List</code> of <code>DebugParam</code> instead of a vararg. Here's a full example, code and execution:</p> <pre><code>import scala.tools.nsc.Interpreter._ object TestDebugger { def main(args: Array[String]) { 0 to 10 foreach { i => breakIf(i == 5, DebugParam("j", i)) println(i) if (i == 7) break(Nil) } } } </code></pre> <p>And then:</p> <pre><code>C:\Users\Daniel\Documents\Scala\Programas>scalac TestDebugger.scala C:\Users\Daniel\Documents\Scala\Programas>scala TestDebugger 0 1 2 3 4 j: Int scala> j res0: Int = 5 scala> :quit 5 6 7 scala> j <console>:5: error: not found: value j j ^ scala> :quit 8 9 10 C:\Users\Daniel\Documents\Scala\Programas> </code></pre>

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