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    <p>Since somebody has to say something, I followed the instructions at <code>Importers</code> to try to compile the tree before returning it.</p> <p>If you give the compiler plenty of stack, it will correctly report the error.</p> <p>(It didn't seem to know what to do with the switch annotation, left as a future exercise.)</p> <pre><code>apm@mara:~/tmp/bigmethod$ skalac bigmethod.scala ; skalac -J-Xss2m biguser.scala ; skala bigmethod.Test Error is java.lang.RuntimeException: Method code too large! Error is java.lang.RuntimeException: Method code too large! biguser.scala:5: error: You ask too much of me. Console println s"5 =&gt; ${BigMethod.lookup(5)}" ^ one error found </code></pre> <p>as opposed to</p> <pre><code>apm@mara:~/tmp/bigmethod$ skalac -J-Xss1m biguser.scala Error is java.lang.StackOverflowError Error is java.lang.StackOverflowError biguser.scala:5: error: You ask too much of me. Console println s"5 =&gt; ${BigMethod.lookup(5)}" ^ </code></pre> <p>where the client code is just that:</p> <pre><code>package bigmethod object Test extends App { Console println s"5 =&gt; ${BigMethod.lookup(5)}" } </code></pre> <p>My first time using this API, but not my last. Thanks for getting me kickstarted.</p> <pre><code>package bigmethod import scala.language.experimental.macros import scala.reflect.macros.Context object BigMethod { // For this simplified example we'll just make some data up. //final val size = 700 final val size = 7000 val mapping = List.tabulate(size)(i =&gt; (i, i + 1)) def lookup(i: Int): Int = macro lookup_impl def lookup_impl(c: Context)(i: c.Expr[Int]): c.Expr[Int] = { def compilable[T](x: c.Expr[T]): Boolean = { import scala.reflect.runtime.{ universe =&gt; ru } import scala.tools.reflect._ //val mirror = ru.runtimeMirror(c.libraryClassLoader) val mirror = ru.runtimeMirror(getClass.getClassLoader) val toolbox = mirror.mkToolBox() val importer0 = ru.mkImporter(c.universe) type ruImporter = ru.Importer { val from: c.universe.type } val importer = importer0.asInstanceOf[ruImporter] val imported = importer.importTree(x.tree) val tree = toolbox.resetAllAttrs(imported.duplicate) try { toolbox.compile(tree) true } catch { case t: Throwable =&gt; Console println s"Error is $t" false } } import c.universe._ val switch = reify(new scala.annotation.switch).tree val cases = mapping map { case (k, v) =&gt; CaseDef(c.literal(k).tree, EmptyTree, c.literal(v).tree) } //val res = c.Expr(Match(Annotated(switch, i.tree), cases)) val res = c.Expr(Match(i.tree, cases)) // before returning a potentially huge tree, try compiling it //import scala.tools.reflect._ //val x = c.Expr[Int](c.resetAllAttrs(res.tree.duplicate)) //val y = c.eval(x) if (!compilable(res)) c.abort(c.enclosingPosition, "You ask too much of me.") res } } </code></pre>
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