Add a compiler hint test

Test that compiler hints are executed transparently.

* test/src/comp-tests.el (comp-tests-type-hints): New test.

* test/src/comp-test-funcs.el (comp-tests-hint-fixnum-f)
(comp-tests-hint-cons-f): New functions.

2 files changed, 12 insertions, 0 deletions

diff --git a/test/src/comp-test-funcs.el b/test/src/comp-test-funcs.el
index 9fcc132b518..5e04be4459f 100644
--- a/test/src/comp-test-funcs.el
+++ b/test/src/comp-test-funcs.el
@@ -50,6 +50,12 @@
 (defun comp-tests-cons-cdr-f (x)
   (cdr (cons 'foo x)))
 
+(defun comp-tests-hint-fixnum-f (n)
+  (1+ (comp-hint-fixnum n)))
+
+(defun comp-tests-hint-cons-f (c)
+  (car (comp-hint-cons c)))
+
 (defun comp-tests-varset0-f ()
   (setq comp-tests-var1 55))
 (defun comp-tests-varset1-f ()
diff --git a/test/src/comp-tests.el b/test/src/comp-tests.el
index c07c92a1065..3e40dba10b4 100644
--- a/test/src/comp-tests.el
+++ b/test/src/comp-tests.el
@@ -194,6 +194,12 @@ Check that the resulting binaries do not differ."
   (should-error (comp-tests-fixnum-minus-f 'a)
                 :type 'wrong-type-argument))
 
+(ert-deftest comp-tests-type-hints ()
+  "Just test compiler hints are transparent in this case."
+  ;; FIXME we should really check they are also effective.
+  (should (= (comp-tests-hint-fixnum-f 3) 4))
+  (should (= (comp-tests-hint-cons-f (cons 1 2)) 1)))
+
 (ert-deftest comp-tests-arith-comp ()
   "Testing arithmetic comparisons."
   (should (eq (comp-tests-eqlsign-f 4 3) nil))