RFR: 7903132: Replace casts with type test pattern

[Ethan McCue]

On Thu, 24 Mar 2022 22:48:41 GMT, Ethan McCue <duke at openjdk.java.net> wrote:

> Replaces a handful of casts following type tests with the equivalent pattern syntax.
> 
> I cannot create a matching issue, as I do not have an account on the bug tracker.

My understanding is that I can't file a JBS issue until I get an account, which only happens after having made two contributions and petitioning for becoming an author.

I can do it the long way around certainly by filing a bug report via the oracle site, but I don't think this is the sort of thing that would make it past that filter.

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PR: https://git.openjdk.java.net/jextract/pull/5