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o Remove the :derive-type option from the defknowns for concatenate
and make-sequence o Add derive-type optimizers for concatenate and make-sequence that only derives the type when the output sequence specifier is a subtype of sequence. (Only done for constant specifiers.) These changes fix the bug where the compiler deletes all code, including the return for (defun foo () (concatenate 'fixnum '(1 2 3))). This is caused by confusion in the compiler where derive-node-type conflicts with the declared return type and causes all trailing blocks to be deleted.
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