+(defvar *eval-source-context* nil)
+
+(defvar *eval-tlf-index* nil)
+(defvar *eval-source-info* nil)
+
+(defun make-eval-lambda (expr)
+ `(named-lambda
+ ;; This name is used to communicate the original context
+ ;; for the compiler, and identifies the lambda for use of
+ ;; EVAL-LAMBDA-SOURCE-LAMBDA below.
+ (eval ,(sb!c::source-form-context *eval-source-context*)) ()
+ (declare (muffle-conditions compiler-note))
+ ;; why PROGN? So that attempts to eval free declarations
+ ;; signal errors rather than return NIL. -- CSR, 2007-05-01
+ (progn ,expr)))
+
+(defun eval-lambda-p (form)
+ (when (and (consp form) (eq 'named-lambda (first form)))
+ (let ((name (second form)))
+ (when (and (consp name) (eq 'eval (first name)))
+ t))))
+
+(defun eval-lambda-source-lambda (eval-lambda)
+ (if (eval-lambda-p eval-lambda)
+ (destructuring-bind (named-lambda name lambda-list decl (progn expr))
+ eval-lambda
+ (declare (ignore named-lambda name lambda-list decl progn))
+ (when (and (consp expr) (member (car expr) '(lambda named-lambda)))
+ expr))
+ eval-lambda))
+