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showCode does not produce executable code #9854

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scabug opened this issue Jul 11, 2016 · 3 comments
Open

showCode does not produce executable code #9854

scabug opened this issue Jul 11, 2016 · 3 comments
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reflection
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Backlog

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@scabug
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scabug commented Jul 11, 2016 

Welcome to Scala 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_77).
Type in expressions for evaluation. Or try :help.

scala> :paste
// Entering paste mode (ctrl-D to finish)

import scala.tools.reflect.ToolBox
import scala.reflect.runtime.universe._
val code = showCode(reify {
  import scala.collection.immutable._
  HashMap(1 -> "x")
}.tree) 
val tb = runtimeMirror(getClass.getClassLoader).mkToolBox()
tb.eval(tb.parse(code))

// Exiting paste mode, now interpreting.

scala.tools.reflect.ToolBoxError: reflective compilation has failed:

object apply is not a member of package HashMap
  at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$ToolBoxGlobal.throwIfErrors(ToolBoxFactory.scala:316)
  at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$ToolBoxGlobal.wrapInPackageAndCompile(ToolBoxFactory.scala:198)
  at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$ToolBoxGlobal.compile(ToolBoxFactory.scala:252)
  at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$$anonfun$compile$2.apply(ToolBoxFactory.scala:429)
  at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$$anonfun$compile$2.apply(ToolBoxFactory.scala:422)
  at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$withCompilerApi$.liftedTree2$1(ToolBoxFactory.scala:355)
  at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$withCompilerApi$.apply(ToolBoxFactory.scala:355)
  at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl.compile(ToolBoxFactory.scala:422)
  at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl.eval(ToolBoxFactory.scala:444)
  ... 37 elided

I expect the code generated by showCode could be parsed and evaluated. Unfortunately it does not.
@scabug
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scabug commented Jul 11, 2016

Imported From: https://issues.scala-lang.org/browse/SI-9854?orig=1
Reporter: @Atry
Affected Versions: 2.11.8

@scabug
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scabug commented Jul 12, 2016

@som-snytt said:
FWIW,

scala> val code = showCode(q"""import scala.collection.immutable._ ; HashMap(1 -> "x")""")
code: String =
{
  import scala.collection.immutable._;
  HashMap((1).->("x"))
}

scala> val tb = runtimeMirror(getClass.getClassLoader).mkToolBox()
tb: scala.tools.reflect.ToolBox[reflect.runtime.universe.type] = scala.tools.reflect.ToolBoxFactory$ToolBoxImpl@270a73ba

scala> tb.eval(tb.parse(code))
res1: Any = Map(1 -> x)

scala> val code = showCode(reify {
     |   import scala.collection.immutable._
     |   HashMap(1 -> "x")
     | }.tree) 
code: String =
{
  import immutable._;
  HashMap.apply(Predef.ArrowAssoc(1).->("x"))
}

@scabug
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scabug commented Aug 3, 2016

@SethTisue said:
I wouldn't get your hopes up for a fix (except in the context of http://scalameta.org)

@scabug scabug added this to the Backlog milestone Apr 7, 2017
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