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47 lines
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<TITLE>CLHS: Section 3.4.1.4.1.1</TITLE>
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<H2>
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3.4.1.4.1.1 Examples of Suppressing Keyword Argument Checking</H2> <P>
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;;; The caller can supply :ALLOW-OTHER-KEYS T to suppress checking.
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((lambda (&key x) x) :x 1 :y 2 :allow-other-keys t) => 1
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;;; The callee can use &ALLOW-OTHER-KEYS to suppress checking.
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((lambda (&key x &allow-other-keys) x) :x 1 :y 2) => 1
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;;; :ALLOW-OTHER-KEYS NIL is always permitted.
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((lambda (&key) t) :allow-other-keys nil) => T
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;;; As with other keyword arguments, only the left-most pair
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;;; named :ALLOW-OTHER-KEYS has any effect.
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((lambda (&key x) x)
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:x 1 :y 2 :allow-other-keys t :allow-other-keys nil)
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=> 1
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;;; Only the left-most pair named :ALLOW-OTHER-KEYS has any effect,
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;;; so in safe code this signals a PROGRAM-ERROR (and might enter the
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;;; debugger). In unsafe code, the consequences are undefined.
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((lambda (&key x) x) ;This call is not valid
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:x 1 :y 2 :allow-other-keys nil :allow-other-keys t)
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</PRE>
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</TT> <P>
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