X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.scl.compiler%2Ftests%2Forg%2Fsimantics%2Fscl%2Fcompiler%2Ftests%2Fscl%2FPolymorphicRecursion.scl;fp=bundles%2Forg.simantics.scl.compiler%2Ftests%2Forg%2Fsimantics%2Fscl%2Fcompiler%2Ftests%2Fscl%2FPolymorphicRecursion.scl;h=ed84193b7f62339402e9499424e56622a7d3c8c2;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/PolymorphicRecursion.scl b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/PolymorphicRecursion.scl
new file mode 100644
index 000000000..ed84193b7
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/PolymorphicRecursion.scl
@@ -0,0 +1,16 @@
+// Idea here is to test the following property:
+// When a function is called recursively it has locally a monomorphic type.
+// Therefore the definition of cons does not work even if it works
+// with a proper type annotation.
+
+data Vec a = Nil | Zero (Vec (a,a)) | One a (Vec (a,a))
+
+// cons :: a -> Vec a -> Vec a
+cons x Nil        = One x Nil
+cons x (Zero ps)  = One x ps
+cons x (One y ps) = Zero (cons (x, y) ps)
+--
+11:21-11:42: Expected <Vec (a, a)> got <Vec a>.
+11:33-11:34: Type (a, a) is not a subtype of a.
+11:36-11:37: Type (a, a) is not a subtype of a.
+11:39-11:41: Expected <Vec a> got <Vec (a, a)>.
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