diff --git a/testsuite/gna/issue1602/repro1.vhdl b/testsuite/gna/issue1602/repro1.vhdl
new file mode 100644
index 0000000000..d9e7014c11
--- /dev/null
+++ b/testsuite/gna/issue1602/repro1.vhdl
@@ -0,0 +1,13 @@
+entity repro1 is
+  generic (c : bit_vector);
+end entity;
+
+architecture behaviour of repro1 is
+
+  signal s : bit_vector(3 downto 0);
+
+begin
+
+  c <= s;
+
+end architecture;
diff --git a/testsuite/gna/issue1602/shadow.vhdl b/testsuite/gna/issue1602/shadow.vhdl
new file mode 100644
index 0000000000..6c7fc878fb
--- /dev/null
+++ b/testsuite/gna/issue1602/shadow.vhdl
@@ -0,0 +1,21 @@
+entity shadow is
+end entity;
+
+architecture behaviour of shadow is
+
+  signal s : bit_vector(3 downto 0);
+
+begin
+
+  process
+
+    procedure example (s : in bit_vector) is
+    begin
+      s <= s;
+    end procedure;
+
+  begin
+    wait;
+  end process;
+
+end architecture;
diff --git a/testsuite/gna/issue1602/testsuite.sh b/testsuite/gna/issue1602/testsuite.sh
new file mode 100755
index 0000000000..0111502742
--- /dev/null
+++ b/testsuite/gna/issue1602/testsuite.sh
@@ -0,0 +1,11 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+export GHDL_STD_FLAGS=--std=93
+analyze_failure shadow.vhdl
+analyze_failure repro1.vhdl
+
+clean
+
+echo "Test successful"