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Fix #4540: Add hint of probable source of issue #4554

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Merged
merged 2 commits into from
May 22, 2018
Merged

Fix #4540: Add hint of probable source of issue #4554

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accfa1a
Fix #4540: Add hint of probable source of issue
nicolasstucki May 22, 2018
c239bdc
Make extra message a full sentence
nicolasstucki May 22, 2018
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8 changes: 5 additions & 3 deletions compiler/src/dotty/tools/dotc/transform/Splicer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -140,7 +140,7 @@ object Splicer {
try classLoader.loadClass(name.toString)
catch {
case _: ClassNotFoundException =>
val msg = s"Could not find interpreted class $name in classpath"
val msg = s"Could not find macro class $name in classpath$extraMsg"
throw new StopInterpretation(msg, pos)
}
}
Expand All @@ -149,17 +149,19 @@ object Splicer {
try clazz.getMethod(name.toString, paramClasses: _*)
catch {
case _: NoSuchMethodException =>
val msg = s"Could not find interpreted method ${clazz.getCanonicalName}.$name with parameters $paramClasses"
val msg = s"Could not find inline macro method ${clazz.getCanonicalName}.$name with parameters $paramClasses$extraMsg"
throw new StopInterpretation(msg, pos)
}
}

private def extraMsg = ". The most common reason for that is that you cannot use inline macro implementations in the same compilation run that defines them"

private def stopIfRuntimeException[T](thunk: => T): T = {
try thunk
catch {
case ex: RuntimeException =>
val sw = new StringWriter()
sw.write("A runtime exception occurred while interpreting\n")
sw.write("A runtime exception occurred while executing macro expansion\n")
sw.write(ex.getMessage)
sw.write("\n")
ex.printStackTrace(new PrintWriter(sw))
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