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Reject unusable overloaded curried functions #8021

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scabug opened this issue Nov 29, 2013 · 4 comments
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Reject unusable overloaded curried functions #8021

scabug opened this issue Nov 29, 2013 · 4 comments
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@scabug
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scabug commented Nov 29, 2013

I can define this object Test without getting an error:

  object Test {
    def f(x: Integer)(y: Boolean) = ???
    def f(x: Integer)(y: String) = ???
  }

However, when I want to use the functions, I can't:

  Test.f(3)(true)     // Error: ambiguous reference to overloaded definition
  Test.f(3)("hello")  // Error: ambiguous reference to overloaded definition

It makes sense for me that this is impossible, but I would like to get an error already when I define f, not only when I want to use it.

Btw this happened in RxScala: There, this method:

https://github.com/Netflix/RxJava/blob/13cd6a9b1813c5dbe5fdd538f18a5f3a2e31e46f/language-adaptors/rxjava-scala/src/main/scala/rx/lang/scala/Scheduler.scala#L122

clashes with this one:

https://github.com/Netflix/RxJava/blob/13cd6a9b1813c5dbe5fdd538f18a5f3a2e31e46f/language-adaptors/rxjava-scala/src/main/scala/rx/lang/scala/Scheduler.scala#L158

and no error was emitted.
@scabug
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scabug commented Nov 29, 2013

Imported From: https://issues.scala-lang.org/browse/SI-8021?orig=1
Reporter: Samuel Grütter (samuelgruetter)
Duplicates #2628

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scabug commented Nov 29, 2013

@paulp said:
Has previously been declared wontfix in #2628.

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scabug commented Nov 30, 2013

@som-snytt said:
The first overload is at line 63.

https://github.com/Netflix/RxJava/blob/13cd6a9b1813c5dbe5fdd538f18a5f3a2e31e46f/language-adaptors/rxjava-scala/src/main/scala/rx/lang/scala/Scheduler.scala#L63

Even if the overloads were selectable, it seems especially perilous because the second param list is either a function or =>Unit, and anything is convertible to Unit by value discarding, or so say the puzzlers.

@scabug scabug closed this as completed Nov 30, 2013
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scabug commented Nov 30, 2013

@retronym said:
Closing as a duplicate.

@scabug scabug mentioned this issue Apr 7, 2017
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