unbound Glossary Section ``U'' unbound variable Glossary Section ``U'' UNBOUND-SLOT Condition Type UNBOUND-SLOT UNBOUND-SLOT-INSTANCE Function UNBOUND-SLOT-INSTANCE UNBOUND-VARIABLE Condition Type UNBOUND-VARIABLE undefined consequences Error Terminology undefined function Glossary Section ``U'' UNDEFINED-FUNCTION Condition Type UNDEFINED-FUNCTION Underscore (format directive) Tilde Underscore: Conditional Newline UNEXPORT Function UNEXPORT unintern Glossary Section ``U'' UNINTERN Function UNINTERN uninterned Glossary Section ``U'' UNION Function UNION, NUNION universal time Glossary Section ``U'' UNLESS Macro WHEN, UNLESS unqualified method Glossary Section ``U'' UNREAD-CHAR Function UNREAD-CHAR unregistered package Glossary Section ``U'' unsafe Error Terminology Glossary Section ``U'' unsafe call Glossary Section ``U'' UNSIGNED-BYTE Type UNSIGNED-BYTE unspecified consequences Error Terminology unspecified values Error Terminology UNTRACE Macro TRACE, UNTRACE UNUSE-PACKAGE Function UNUSE-PACKAGE UNWIND-PROTECT Special Operator UNWIND-PROTECT UPDATE-INSTANCE-FOR-DIFFERENT-CLASS Standard Generic Function UPDATE-INSTANCE-FOR-DIFFERENT-CLASS UPDATE-INSTANCE-FOR-REDEFINED-CLASS Standard Generic Function UPDATE-INSTANCE-FOR-REDEFINED-CLASS upgrade Glossary Section ``U'' upgraded array element type Glossary Section ``U'' upgraded complex part type Glossary Section ``U'' UPGRADED-ARRAY-ELEMENT-TYPE Function UPGRADED-ARRAY-ELEMENT-TYPE UPGRADED-COMPLEX-PART-TYPE Function UPGRADED-COMPLEX-PART-TYPE UPPER-CASE-P Function UPPER-CASE-P, LOWER-CASE-P, BOTH-CASE-P uppercase Glossary Section ``U'' use Glossary Section ``U'' use list Glossary Section ``U'' USE-PACKAGE Function USE-PACKAGE use-value Function ABORT, CONTINUE, MUFFLE-WARNING, STORE-VALUE, USE-VALUE USE-VALUE Restart USE-VALUE Function ABORT, CONTINUE, MUFFLE-WARNING, STORE-VALUE, USE-VALUE USER Packages No Longer Required user Glossary Section ``U'' USER-HOMEDIR-PATHNAME Function USER-HOMEDIR-PATHNAME