Compiler crash when invoking a private constructor with invalid arguments

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If one invokes a private / protected constructor with an invalid number of arguments (or a mismatched signature), the compiler will crash with an "Unexpected New" exception.

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Imported From: https://issues.scala-lang.org/browse/SI-4987?orig=1
Reporter: @melezov
Affected Versions: 2.9.1, 2.10.0
Other Milestones: 2.10.0
Attachments:

• crash.log (created on Sep 11, 2011 12:58:56 AM UTC, 7668 bytes)
• FooBar.scala (created on Sep 11, 2011 12:44:51 AM UTC, 258 bytes)

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@melezov said:
Compiler crash output

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@melezov said (edited on Sep 12, 2011 1:51:09 PM UTC):
This also seems to occur when the arguments sent to the private/protected constructor match the signature, but only if there is more than one:

/* This will not crash, but rather complain, which is OK */
class Foo private (a: Int)
object Bar { new Foo(0) }

/* This will slay the compiler */
class Foo2 private (a: Int, b: Int)
object Bar2 { new Foo2(0, 0) }

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@paulp said:
See also duplicates #4645, #4685, #4707, #5058, especially my comment in #4645. Consolidated under this one.

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@paulp said:
See also #5063, which is not exactly the same bug but should be considered when fixing this one.

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@odersky said (edited on Mar 21, 2012 2:58:15 PM UTC):
I can't reproduce it. Seems it has been fixed in the meantime? When I compile FooBar.scala, I get

/Users/odersky/Downloads/FooBar.scala:9: error: constructor Foo in class Foo cannot be accessed in object Bar
new Foo(null, null)
^
one error found

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@soc said:
Also crashes on Scala version 2.10.0-M2-0152-g5dca64cefe-2012-03-13.

error: Unexpected New(TypeTree class $read$Foo2/Foo2) received in icode.
  Call was genLoad(new Foo2,	package: $line2
	clazz: Bar2
	method: Bar2.<init>
	bb: 1
	labels: Map()
	exception handlers: List()
	cleanups: List()
	scope: [][][]
,REF(class Object))
error: 
     while compiling:  <console>
       current phase:  icode
     library version:  version 2.10.0-M2-0152-g5dca64cefe-2012-03-13
    compiler version:  version 2.10.0-M2-0152-g5dca64cefe-2012-03-13
  reconstructed args:  

uncaught exception during compilation: scala.reflect.internal.FatalError
scala.reflect.internal.FatalError: 
     while compiling:  <console>
       current phase:  icode
     library version:  version 2.10.0-M2-0152-g5dca64cefe-2012-03-13
    compiler version:  version 2.10.0-M2-0152-g5dca64cefe-2012-03-13
  reconstructed args:  

Unexpected New(TypeTree class $read$$iw$$iw$Foo2/$line1.$read$$iw$$iw$Foo2) received in icode.
  Call was genLoad(new $line1.$read$$iw$$iw$Foo2,	package: $line2
	clazz: $line2.$read$$iw$$iw$Bar2
	method: $line2.$read$$iw$$iw$Bar2.<init>
	bb: 1
	labels: Map()
	exception handlers: List()
	cleanups: List()
	scope: [][][]
,REF(class Object))
	at scala.reflect.internal.SymbolTable.abort(SymbolTable.scala:38)
	at scala.tools.nsc.Global.abort(Global.scala:189)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:707)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genLoadArguments$1.apply(GenICode.scala:1200)

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@paulp said:
It does crash until very recently, but not in master.

// 2.10.0-20120320-201545-fcc63e2b66
scalac ./a.scala 
./a.scala:10: error: constructor Foo2 in class Foo2 cannot be accessed in object Bar2
object Bar2 { new Foo2(0, 0) }
              ^
one error found

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@paulp said:
fb788e03f6