src/method-impl.lisp, etc.: Add a `readonly' message property.
authorMark Wooding <mdw@distorted.org.uk>
Sun, 6 Oct 2019 21:41:42 +0000 (22:41 +0100)
committerMark Wooding <mdw@distorted.org.uk>
Sun, 6 Oct 2019 23:18:28 +0000 (00:18 +0100)
If you have a `const' instance, it's useful to be able to send it
messages, so add a facility for marking messages as not modifying their
receivers.


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