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Companion warning when compilation fails #11864

Jasper-M opened this issue Jan 27, 2020 · 1 comment

Companion warning when compilation fails #11864

Jasper-M opened this issue Jan 27, 2020 · 1 comment


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@Jasper-M Jasper-M commented Jan 27, 2020

scala> object Foo { private def foo = 0 }
object Foo

scala> class Foo
class Foo
warning: previously defined object Foo is not a companion to class Foo.
Companions must be defined together; you may wish to use :paste mode for this.
scala> object Bar { private def bar = 0 }
object Bar

scala> class Bar { def a = }
       error: method bar in object Bar cannot be accessed as a member of object Bar from class Bar

Would be very helpful if you'd also get the warning when compilation of the non-companion fails.
As seen on

@dwijnand dwijnand added the repl label Jan 27, 2020

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@som-snytt som-snytt commented Jan 27, 2020

Currently it lints every successful compilation, and warns even if the other class is buried deep in history.

An improved behavior would be to detect a candidate companion in the previous line and restart the multiline edit. User can then decide to hit enter if that's what they intended, or make corrections.

@lrytz lrytz added this to the Backlog milestone Jan 30, 2020
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