[code-reflection] RFR: Make Quotable a marker interface

[Maurizio Cimadamore]

On Mon, 6 Jan 2025 22:28:03 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> I am not very concerned about performance in the Interpreter, but i am all for reducing the complexity! Having an internal interface will reduce the complexity.

I think the internal interface will also improve performance of the new Op::ofQuotable (which currently uses reflection to discover the magic method it knows to be there)

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PR Review Comment: https://git.openjdk.org/babylon/pull/302#discussion_r1905294137