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Expr-extension

Make-expr-extension

Basic constructor macro for expr-extension structures.

Syntax

(make-expr-extension [:expr <expr>])

This is the usual way to construct expr-extension structures. It simply conses together a structure with the specified fields.

This macro generates a new expr-extension structure from scratch. See also change-expr-extension, which can "change" an existing structure, instead.

Definition

This is an ordinary make- macro introduced by fty::defprod.

Macro: make-expr-extension

(defmacro make-expr-extension (&rest args)
  (std::make-aggregate 'expr-extension
                       args '((:expr))
                       'make-expr-extension
                       nil))

Function: expr-extension

(defun expr-extension (expr)
  (declare (xargs :guard (exprp expr)))
  (declare (xargs :guard t))
  (b* ((expr (mbe :logic (expr-fix expr)
                  :exec expr)))
    (cons :extension expr)))