Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / test-suite / tests / continuations.test

diff --git a/guile18/test-suite/tests/continuations.test b/guile18/test-suite/tests/continuations.test
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+;;;;                                                          -*- scheme -*-
+;;;; continuations.test --- test suite for continutations
+;;;;
+;;;; Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+;;;; 
+;;;; This program is free software; you can redistribute it and/or modify
+;;;; it under the terms of the GNU General Public License as published by
+;;;; the Free Software Foundation; either version 2, or (at your option)
+;;;; any later version.
+;;;; 
+;;;; This program is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;;; GNU General Public License for more details.
+;;;; 
+;;;; You should have received a copy of the GNU General Public License
+;;;; along with this software; see the file COPYING.  If not, write to
+;;;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;;;; Boston, MA 02110-1301 USA
+
+(define-module (test-suite test-continuations)
+  :use-module (test-suite lib))
+
+(define (block-reentry body)
+  (let ((active #f))
+    (dynamic-wind
+       (lambda () 
+         (if active
+             (throw 'no-reentry)))
+       (lambda ()
+         (set! active #t)
+         (body))
+       (lambda () #f))))
+
+(define (catch-tag body)
+  (catch #t
+        body
+        (lambda (tag . args) tag)))
+
+(define (check-cont)
+  (catch-tag 
+   (lambda ()
+     (block-reentry (lambda () (call/cc identity))))))
+
+(define (dont-crash-please)
+  (let ((k (check-cont)))
+    (if (procedure? k)
+       (k 12)
+       k)))
+
+(with-test-prefix "continuations"
+
+  (pass-if "throwing to a rewound catch context"
+    (eq? (dont-crash-please) 'no-reentry))
+
+  (with-debugging-evaluator
+
+    (pass-if "make a stack from a continuation"
+      (stack? (call-with-current-continuation make-stack)))
+
+    (pass-if "get a continuation's stack ID"
+      (let ((id (call-with-current-continuation stack-id)))
+       (or (boolean? id) (symbol? id))))
+
+    (pass-if "get a continuation's innermost frame"
+      (pair? (call-with-current-continuation last-stack-frame))))
+
+)