misleading error message when constructor parameter list is missing

[scabug]

scala> class C(x: Int = 1)(y: Int)

scala> new C()
<console>:9: error: missing arguments for constructor C in class C
Error occurred in an application involving default arguments.

This does not tell you that an entire parameter list is missing. You might be tempted to think that there's a problem with the default.

For methods we're good:

scala> def foo(x: Int = 1)(y: Int) = 1

scala> foo()
<console>:9: error: missing arguments for method foo;
follow this method with `_' if you want to treat it as a partially applied function

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-7101?orig=1
Reporter: @lrytz

[scabug]

@som-snytt said:
Full disclosure:

cala> class C(x: Int = 1)(y: Int)
defined class C

scala> new C
<console>:14: error: missing argument list for constructor C in class C
Error occurred in an application involving default arguments.
       new C
       ^

scala> new C()
<console>:14: error: missing argument list for constructor C in class C
Error occurred in an application involving default arguments.
       new C()
       ^

scala> new C()()
<console>:14: error: not enough arguments for constructor C: (y: Int)C.
Unspecified value parameter y.
       new C()()
       ^

These error messages are especially problematic because repl doesn't offer completion for constructors, so you really don't know what you're looking at.