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Return type of method not checked when overriding methods from self type in trait #9736

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scabug opened this issue Apr 6, 2016 · 1 comment
Open

Return type of method not checked when overriding methods from self type in trait #9736

scabug opened this issue Apr 6, 2016 · 1 comment
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@scabug
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scabug commented Apr 6, 2016

When overriding a method from the self type of a trait the return type is not checked so this compiles:

trait A {
    def a: Int
}
trait B { self: A =>
    override def a: String = "Well this should not compile"
}

The compile error happens when B is used:

scala> class C extends A with B
<console>:9: error: overriding method a in trait A of type => Int;
 method a in trait B of type => String has incompatible type
       class C extends A with B
             ^

The compile error should already happen when defining B as the method overrides nothing.
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scabug commented Apr 6, 2016

Imported From: https://issues.scala-lang.org/browse/SI-9736?orig=1
Reporter: Merlin Göttlinger (mgttlinger)
Affected Versions: 2.11.6, 2.11.8

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