Imported From: https://issues.scala-lang.org/browse/SI-4685?orig=1
Reporter: Jan van der Vorst (janvandervorst)
Affected Versions: 2.9.0

Jan van der Vorst (janvandervorst) said:
Just checked that the crash occurs since version 2.9.0

@paulp said:
Hijinx break out in typer when it goes hunting for a way to satisfy new Foo(1, 2). Only happens if Foo has no non-private constructors and at least two constructor parameters.

?{val this: ?}? is an interesting thing to be looking for.

Beginning implicit search for new Foo expecting (Foo) => ?{val this: ?} looking for a view
 ...
    typed implicit scala.this.Predef.any2stringadd(<argument>):scala.runtime.StringAdd, pt = (Foo) => ?{val this: ?}
    adapted implicit method any2stringadd:(x: Any)scala.runtime.StringAdd to (Foo) => ?{val this: ?}
    tvars = List()/List()
RESULT = SearchResult(scala.this.Predef.any2stringadd, TreeTypeSubstituter(List(),List()))

Norman Walsh (ndw) said:
For what it's worth, I'm seeing this bug in some code that doesn't have any private constructors. If someone's working on it, I can send a test case.

Norman Walsh (ndw) said:
I downloaded the 2.8.1-final version of the compiler to see if that would help me find the problem. Success!

Off in some stale testing code, I had written

val id = new InputDeclaration("input", false, DOCUMENT, "//*")

As I'd made progress, I'd made the InputDeclaration constructor "protected[model]" and changed its arguments. The 2.8.1-final compiler objected:

src/com/xmlcalabash/driver/Test.scala:29: error: overloaded method constructor InputDeclaration with alternatives:
(parent: com.xmlcalabash.model.Artifact,portName: String,sequence: Boolean,kind: com.xmlcalabash.model.DocumentKind.DocumentKind,select: String,primary: Boolean)com.xmlcalabash.model.InputDeclaration
(parent: com.xmlcalabash.model.Artifact,portName: String,isSeq: Boolean,docKind: com.xmlcalabash.model.DocumentKind.DocumentKind,selectExpr: String)com.xmlcalabash.model.InputDeclaration
cannot be applied to (java.lang.String, Boolean, com.xmlcalabash.model.DocumentKind.Value, java.lang.String)
val id = new InputDeclaration("input", false, DOCUMENT, "//*")

Removing my out-of-date and bogus testing code seems to have resolved the 2.9.0.1 compiler crash.

Hope that helps.

@paulp said:
#4645, #4685, #4707, #4987, #5058 are all the same bug. Consolidating under #4987.