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 Universal Time Glossary Section ``U'' UNLESS Macro WHEN, UNLESS unless (loop keyword) Summary of Conditional Execution Clauses Conditional Execution Clauses Macro LOOP 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 :unspecific The Pathname Type Component The Pathname Version Component :UNSPECIFIC as a Component Value Relation between component values NIL and :UNSPECIFIC Restrictions on Examining a Pathname Device Component Restrictions on Examining a Pathname Directory Component Restrictions on Examining a Pathname Name Component Restrictions on Examining a Pathname Type Component Restrictions on Examining a Pathname Version Component Merging Pathnames Examples of Merging Pathnames The Device part of a Logical Pathname Namestring Unspecific Components of a Logical Pathname Function MAKE-PATHNAME Function USER-HOMEDIR-PATHNAME Glossary Section ``V'' unspecified consequences Error Terminology unspecified values Error Terminology until (loop keyword) Summary of Termination Test Clauses Termination Test Clauses Macro LOOP UNTRACE Macro TRACE, UNTRACE UNUSE-PACKAGE Function UNUSE-PACKAGE UNWIND-PROTECT Special Operator UNWIND-PROTECT :up Restrictions on Examining a Pathname Directory Component Directory Components in Non-Hierarchical File Systems :upcase The Standard Readtable Symbols as Tokens Valid Patterns for Tokens Effect of Readtable Case on the Lisp Printer Variable *PRINT-CASE* Effect of Readtable Case on the Lisp Reader Macro WITH-STANDARD-IO-SYNTAX Glossary Section ``C'' 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 upfrom (loop keyword) The for-as-arithmetic subclause Macro LOOP 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'' upto (loop keyword) The for-as-arithmetic subclause Macro LOOP use Glossary Section ``U'' :use Function MAKE-PACKAGE Macro DEFPACKAGE 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 using (loop keyword) The for-as-hash subclause Macro LOOP