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-rw-r--r--gcc/cp/pt.c2
-rw-r--r--gcc/testsuite/g++.dg/cpp2a/nontype-complex1.C8
2 files changed, 10 insertions, 0 deletions
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 32cd0b7..cbd2f3d 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -26563,6 +26563,8 @@ invalid_nontype_parm_type_p (tree type, tsubst_flags_t complain)
else if (cxx_dialect >= cxx11
&& TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
return false;
+ else if (TREE_CODE (type) == COMPLEX_TYPE)
+ /* Fall through. */;
else if (VOID_TYPE_P (type))
/* Fall through. */;
else if (cxx_dialect >= cxx20)
diff --git a/gcc/testsuite/g++.dg/cpp2a/nontype-complex1.C b/gcc/testsuite/g++.dg/cpp2a/nontype-complex1.C
new file mode 100644
index 0000000..4de2168
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/nontype-complex1.C
@@ -0,0 +1,8 @@
+// PR c++/100634
+// { dg-do compile { target c++20 } }
+// { dg-options "" }
+
+// We could support _Complex template arguments, but better I think to make
+// people use a standard type instead.
+template<_Complex int> struct ComplexInt {}; // { dg-error "not a valid type" }
+using CI = ComplexInt<1 + 3i>;