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Improve error checking of defmacro lambda-lists. Checking for compatible
number of arguments was being disabled in the presence of a dotted lambda-list or when a &rest keyword is present. Change this so that the test is only disabled for dotted lambda-lists. This modification fixes a number of bugs in source-transforms used by the compiler, since the macro lambda-list parsing code is used to determine whether a given source-transform can be applied to the form being compiled. When source-transforms were defined for functions with &rest parameters, the macro-lambda-list checking was not signalling an error when an inappropriate number of arguments were present in the form being compiled. This resulted in inappropriate use of the source-transform. This change reveals a problem in the gray-stream class definitions (now fixed).
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