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nutty disambiguation of type aliases in error messages #8892

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scabug opened this issue Oct 7, 2014 · 2 comments
Closed

nutty disambiguation of type aliases in error messages #8892

scabug opened this issue Oct 7, 2014 · 2 comments
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@retronym
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usability
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2.11.8

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@scabug
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scabug commented Oct 7, 2014 

trait A { type B = String }
class C[B](x: B) extends A { def f: B = x }
qscalac sandbox/gist.scala
sandbox/gist.scala:2: error: type mismatch;
 found   : B
 required: C.this.java.lang.B
    (which expands to)  String
class C[B](x: B) extends A { def f: B = x }
                                        ^
one error found

The culprit:

    // functions to manipulate the name
    def preQualify()   = modifyName(trueOwner.fullName + "." + _)
    def postQualify()  = modifyName(_ + "(in " + trueOwner + ")")
    def typeQualify()  = if (sym.isTypeParameterOrSkolem) postQualify()
    def nameQualify()  = if (trueOwner.isPackageClass) preQualify() else postQualify()

    def trueOwner  = tp.typeSymbol.effectiveOwner
    def aliasOwner = tp.typeSymbolDirect.effectiveOwner

scala/scala@beadafa2
@scabug
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scabug commented Oct 7, 2014

Imported From: https://issues.scala-lang.org/browse/SI-8892?orig=1
Reporter: @retronym
Affected Versions: 2.10.0-M5, 2.10.4, 2.11.2

@scabug
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scabug commented Jun 20, 2015

@retronym said:
scala/scala#4569

@scabug scabug closed this as completed Jun 30, 2015
@scabug scabug added this to the 2.11.8 milestone Apr 7, 2017
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