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ANSI Common Lisp  3 Evaluation and Compilation 3.5 Error Checking in Function Calls 3.5.1 Argument Mismatch Detection
3.5.1.4 Unrecognized Keyword Arguments
It is not permitted to supply a keyword argument to a function
using a name that is not recognized by that function
unless keyword argument checking is suppressed as described
in Section 3.4.1.4.1 Suppressing Keyword Argument Checking.
If this situation occurs in a safe call,
an error of type program-error must be signaled;
and in an unsafe call the situation has undefined consequences.
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