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@odersky odersky commented Dec 13, 2014

This is necessary to reject code like

 val x: Boolean = null

Without the restriction, this code would typecheck and expand to

 val x: Boolean = Predef.Boolean2boolean(null)

since null counts as a value of type java.lang.Boolean.

Closes #291. Review by @smarter

This is necessary to reject code like

     val x: Boolean = null

Without the restriction, this code would typecheck and expand to

     val x: Boolean = Predef.Boolean2boolean(null)

since `null` counts as a value of type `java.kang.Boolean`.
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smarter commented Dec 13, 2014

LGTM!

odersky added a commit that referenced this pull request Dec 13, 2014
…nforms

Disable implicit conversions between from `Null` and `Nothing`.
@odersky odersky merged commit 6542458 into scala:master Dec 13, 2014
@allanrenucci allanrenucci deleted the fix/#291-null-primitive-conforms branch December 14, 2017 19:21
tgodzik added a commit to tgodzik/scala3 that referenced this pull request Apr 29, 2025
Backport "Nowarn public implicit val class params" to 3.3 LTS
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2 participants