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A DAP client can request that an expression be evaluated in "hover" context, meaning that it should not cause side effects. In gdb, this can be implemented by temporarily setting a few "may-" parameters to "off". In order to make this work, I had to also change "may-write-registers" so that it can be changed while the program is running. I don't think there was any reason for this prohibition in the first place. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30476