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Method type parameter not substituted into structural refinement #9222

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scabug opened this issue Mar 14, 2015 · 2 comments
Open

Method type parameter not substituted into structural refinement #9222

scabug opened this issue Mar 14, 2015 · 2 comments
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@scabug
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@scabug scabug commented Mar 14, 2015

I expect the following code to compile without errors:

trait Elem {
    type Peer
}

trait Impl[E[~] <: Elem {type Peer = ~}] {
    def foo[R](peer: E[R]#Peer)

    foo[Int](??? : E[Int]#Peer)
}

Instead, an error is given that:

Error:(12, 18) type mismatch;
 found   : this.scala.Peer
    (which expands to)  Int
 required: this.Peer(in method foo)
    (which expands to)  R
    foo[Int](??? : E[Int]#Peer)
             ^^

It looks as if the variable R is not getting substituted in the structural refinement part of the type.

This comes from http://stackoverflow.com/questions/28945416/type-mismatch-with-type-projection

@scabug
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@scabug scabug commented Mar 14, 2015

Imported From: https://issues.scala-lang.org/browse/SI-9222?orig=1
Reporter: Owen Healy (ellbur)
Affected Versions: 2.11.6

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@dwijnand
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@dwijnand dwijnand commented Oct 14, 2020

Reverted

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@dwijnand dwijnand reopened this Oct 14, 2020
@SethTisue SethTisue removed this from the 2.13.4 milestone Oct 14, 2020
@SethTisue SethTisue added this to the Backlog milestone Oct 14, 2020
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3 participants