java.lang.NullPointerException instead of scala.UnitializedFieldE…

[colin4124]

Type of change: bug report

Impact: no functional change

Development Phase: implementation

Thanks @seldridge

class Foo { val x: Int = 1 }
class Bar { println(child.x); val child = new Foo }
new Bar

Run in a repl without and with the -Xcheckinit option on, it'll either be a java.lang.NullPointerException or a scala.UnitializedFieldError.

If using scala.UnitializedFieldError , Run mill chisel3.test will report error as below in ModuleSpec

- A desiredName parameterized by a submodule should work
[info] [0.000] Elaborating design...
- A name generating a null pointer exception should provide a good error message *** FAILED ***
  "Uninitialized field:  chisel3/src/test/scala/chiselTests/Module.scala: 75" did not include substring "desiredName of chiselTests.NullModuleWrapper is null" (Module.scala:159)

[ghost]

Can one of the admins verify this patch?

[seldridge]

ok to test

[seldridge]

lgtm

I don't think I have Jenkins powers, so this may require somebody else to get Jenkins CI moving.

[ucbjrl]

ok to test