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11.1.2.1.2 Constraints on the COMMON-LISP Package for Conforming Programs
   Except where explicitly allowed, the consequences are undefined if any of the following actions are performed on an external symbol of the COMMON-LISP package: 
- 1.  Binding or altering its value (lexically or dynamically). (Some exceptions are noted below.) 
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- 2.  Defining,  undefining,  or binding it as a function. (Some exceptions are noted below.) 
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- 3.  Defining,  undefining,  or binding it as a macro  or compiler macro.  (Some exceptions are noted below.) 
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- 4.  Defining it as a type specifier (via defstruct, defclass, deftype, define-condition). 
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- 5.  Defining it as a structure (via defstruct). 
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- 6.  Defining it as a declaration with a declaration proclamation. 
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- 7.  Defining it as a symbol macro. 
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- 8.  Altering its home package. 
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- 9.  Tracing it (via trace). 
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- 10.  Declaring or proclaiming it special (via declare,  declaim,  or proclaim). 
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- 11.  Declaring or proclaiming its type or ftype (via declare,  declaim,  or proclaim). (Some exceptions are noted below.) 
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- 12.  Removing it from the COMMON-LISP package. 
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- 13.  Defining a setf expander for it (via defsetf or define-setf-method). 
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- 14.  Defining, undefining, or binding its setf function name. 
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- 15.  Defining it as a method combination type (via define-method-combination). 
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- 16.  Using it as the class-name argument to setf of find-class. 
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- 17.  Binding it as a catch tag. 
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- 18.  Binding it as a restart name. 
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- 19.  Defining a method for a standardized generic function which is applicable when all of the arguments are direct instances of standardized classes. 
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11.1.2.1.2.1 Some Exceptions to Constraints on the COMMON-LISP Package for Conforming Programs
The following X3J13 cleanup issues, not part of the specification, apply to this section:
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