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-rw-r--r--gcc/testsuite/g++.dg/cpp1z/class-deduction43.C10
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diff --git a/gcc/testsuite/g++.dg/cpp1z/class-deduction43.C b/gcc/testsuite/g++.dg/cpp1z/class-deduction43.C
new file mode 100644
index 00000000000..a906a0f3626
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1z/class-deduction43.C
@@ -0,0 +1,10 @@
+// PR c++/79790
+// { dg-options -std=c++1z }
+
+template <int N>
+struct array
+{
+ int a [N];
+};
+
+array a = { 1, 2, 3 }; // { dg-error "cannot deduce" }