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match statement with continuations causes "cps-transformed unexpectedly" warning and crash #6817

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scabug opened this issue Dec 15, 2012 · 4 comments
Closed

match statement with continuations causes "cps-transformed unexpectedly" warning and crash #6817

scabug opened this issue Dec 15, 2012 · 4 comments
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patmat won't fix

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@scabug
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scabug commented Dec 15, 2012

Mixing pattern matching and continuations causes an surprising warning in 2.10.0-RC5, though the code compiles fine in 2.9.2

$ /usr/local/scala-2.10.0-RC5/bin/scalac -P:continuations:enable bug1.scala
bug1.scala:7: warning: expression matchEnd6(x: Int){
x
} is cps-transformed unexpectedly
x match {
^
one warning found

When the case analysis appears in a catch statement, the warning becomes a compiler crash that has a lot to say about itself. I've attached the output of

$ /usr/local/scala-2.10.0-RC5/bin/scalac -P:continuations:enable bug2.scala
@scabug
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scabug commented Dec 15, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6817?orig=1
Reporter: Topher (topher.the.geek)
Affected Versions: 2.10.0-RC5
Attachments:

  • bug1.scala (created on Dec 15, 2012 6:50:13 AM UTC, 243 bytes)
  • bug2.scala (created on Dec 15, 2012 6:50:13 AM UTC, 245 bytes)
  • out (created on Dec 15, 2012 6:50:13 AM UTC, 67735 bytes)

@scabug
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scabug commented Jan 4, 2013

Ngoc Dao (ngocdaothanh) said:
I've also seen this warning:

[warn] /Users/ngoc/src/xitrum-demos/src/main/scala/demos/controller/BoringGreeter.scala:79: expression matchEnd7(x: String){
[warn] x
[warn] } is cps-transformed unexpectedly
[warn] params.get("Favorite book") match {
[warn] ^
[warn] one warning found

To reproduce it:
git clone git://github.com/ngocdaothanh/xitrum-demos.git
cd xitrum-demos
sbt/sbt run

@scabug
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scabug commented Feb 26, 2015

@adriaanm said:
Sorry, the continuations plugin has been unsupported for a while now. Please open an issue over at https://github.com/scala/scala-continuations (we're still looking for a maintainer for it, though).

@scabug scabug closed this as completed Feb 26, 2015
@scabug
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scabug commented Aug 11, 2016

@SethTisue said:
there is now a GitHub issue at scala/scala-continuations#15

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