Uncaught exception during compilation

[scabug]

Compiler crashes during compilation:

java.lang.RuntimeException: scala.Array.apply : Object, Object, Any
at scala.sys.package$.error(package.scala:27)...

Please see attached SBT project which reproduces the issue. (it has a library dependency on Shapeless)

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-6975?orig=1
Reporter: @benhutchison
Affected Versions: 2.10.0, 2.11.0-M1
Attachments:

• bug_example.zip (created on Jan 15, 2013 11:25:33 AM UTC, 178059 bytes)

[scabug]

@benhutchison said:
I just tested 2.11.0-M1 and 2.11.0-SNAPSHOT (Jan 17) and saw crashes in both.

On 2.11.0-M1 only, I saw this message:

[error] C:\Users\ben\workspace\bug_example\src\main\scala\cycad\BugExample.scala:33: diverging implicit expansion for ty
pe shapeless.Prod[shapeless.Nat._1,shapeless.Nat._3]
[error] starting with method prod in object Prod
[error] val m1x3 = matrix[Int, _1, _3].fromRowMajor(Sized[Array](1, 2, 3))

However, commenting out that line alone caused the crash to re-occur, presumably from the previous line.

[scabug]

Ben Hutchison (ben_hutchison) said:
This is a sympton of #7088