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Jim Blandy * remote.c (fetch_register_using_p): Recognize 'x's for the value of the register as indicating that the register's value is not available.
Out of curiosity, under what practical circumstances would the value of a register not be accessible? (and if not, shouldn't an error be returned, as opposed to an 'x' which is converted to a 0 anyway? Which I've noticed "g" packets also assume?)
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