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    • Annotate

    Bind-fn-annotation

    Get the annotation associated with the innermost call of the given function being rewritten

    Usage:

    (bind-fn-annotation free-var 'my-fn)

    finds the record of the innermost call of my-fn in the FGL rewriter's stack, and checks whether there was a call of annotate wrapped immediately around it. If so, it binds the given free variable to the first argument of that call of annotate; otherwise, it binds it to NIL. The bind-fn-annotation form always returns T, so it can be used as a hypothesis in a rewrite rule.

    A related utility is bind-nth-fn-annotation which gets the annotation associated with the nth-innermost call of the function, rather than the innermost.