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documentationf �Returns the result(s) of invoking THUNK. HANDLER must be a
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with-exception-handler that installed the handler being called. The
handler's continuation is otherwise unspecified.� CR4
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documentationf �Syntax: (guard (<var> <clause1> <clause2> ...) <body>)
Each <clause> should have the same form as a `cond' clause.
Semantics: Evaluating a guard form evaluates <body> with an exception
handler that binds the raised object to <var> and within the scope of
that binding evaluates the clauses as if they were the clauses of a
cond expression. That implicit cond expression is evaluated with the
continuation and dynamic environment of the guard expression. If
every <clause>'s <test> evaluates to false and there is no else
clause, then raise is re-invoked on the raised object within the
dynamic environment of the original call to raise except that the
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