Created
November 16, 2016 21:02
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| > scala ~/.ivy2/cache/com.lihaoyi/scalatags_2.11/jars/scalatags_2.11-0.6.0.jar -Xprint:typer -e "scalatags.Text.all" | |
| java.lang.NullPointerException | |
| at java.lang.Class.forName0(Native Method) | |
| at java.lang.Class.forName(Class.java:348) | |
| at scala.reflect.internal.util.ScalaClassLoader$$anonfun$tryClass$1.apply(ScalaClassLoader.scala:43) | |
| at scala.reflect.internal.util.ScalaClassLoader$$anonfun$tryClass$1.apply(ScalaClassLoader.scala:43) | |
| at scala.util.control.Exception$Catch$$anonfun$opt$1.apply(Exception.scala:119) | |
| at scala.util.control.Exception$Catch$$anonfun$opt$1.apply(Exception.scala:119) | |
| at scala.util.control.Exception$Catch.apply(Exception.scala:103) | |
| at scala.util.control.Exception$Catch.opt(Exception.scala:119) | |
| at scala.reflect.internal.util.ScalaClassLoader$class.tryClass(ScalaClassLoader.scala:42) | |
| at scala.reflect.internal.util.ScalaClassLoader$class.tryToInitializeClass(ScalaClassLoader.scala:39) | |
| at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.tryToInitializeClass(ScalaClassLoader.scala:101) | |
| at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63) | |
| at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101) | |
| at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22) | |
| at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13) | |
| at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29) | |
| at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25) | |
| at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69) | |
| at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87) | |
| at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98) | |
| at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103) | |
| at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala) | |
| > scala -Xprint:typer -e "()" | |
| Exception in thread "main" java.net.UnknownHostException: renzo: renzo: Name or service not known | |
| at java.net.InetAddress.getLocalHost(InetAddress.java:1505) | |
| at scala.tools.nsc.io.Socket$.localhost(Socket.scala:28) | |
| at scala.tools.nsc.CompileSocket.getsock$1(CompileSocket.scala:175) | |
| at scala.tools.nsc.CompileSocket.getOrCreateSocket(CompileSocket.scala:190) | |
| at scala.tools.nsc.ScriptRunner.compileWithDaemon(ScriptRunner.scala:70) | |
| at scala.tools.nsc.ScriptRunner.scala$tools$nsc$ScriptRunner$$compile$1(ScriptRunner.scala:113) | |
| at scala.tools.nsc.ScriptRunner$$anonfun$withCompiledScript$1.apply$mcZ$sp(ScriptRunner.scala:161) | |
| at scala.tools.nsc.ScriptRunner$$anonfun$withCompiledScript$1.apply(ScriptRunner.scala:129) | |
| at scala.tools.nsc.ScriptRunner$$anonfun$withCompiledScript$1.apply(ScriptRunner.scala:129) | |
| at scala.tools.nsc.util.package$.trackingThreads(package.scala:43) | |
| at scala.tools.nsc.util.package$.waitingForThreads(package.scala:27) | |
| at scala.tools.nsc.ScriptRunner.withCompiledScript(ScriptRunner.scala:128) | |
| at scala.tools.nsc.ScriptRunner.runCommand(ScriptRunner.scala:222) | |
| at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:85) | |
| at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98) | |
| at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103) | |
| at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala) | |
| Caused by: java.net.UnknownHostException: renzo: Name or service not known | |
| at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) | |
| at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928) | |
| at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323) | |
| at java.net.InetAddress.getLocalHost(InetAddress.java:1500) | |
| ... 16 more |
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So what I'd recommend: take your example code using mistery implicits, pass it to
-eor put it in a file or paste it at the REPL, and use-Xprint:typerto see the inserted implicits. Actually,scalac ... -Xprint:typer Foo.scalawould avoid inserting the REPL junk, so you'd only have the other junk from the typechecker. But I still think that can be rather useful.The other approach, when it works, it to use an IDE highlighting implicits and use "open implicit", but those are annoying in different ways and you have to use Eclipse/ScalaIDE over IntelliJ for reliable results.