4 files changed, 52 insertions, 0 deletions
diff --git a/testsuite/synth/issue1240/issue1.vhdl b/testsuite/synth/issue1240/issue1.vhdl
new file mode 100644
index 000000000..cc5bf9f46
--- /dev/null
+++ b/testsuite/synth/issue1240/issue1.vhdl
@@ -0,0 +1,12 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity issue1 is
+    port (foobar : out signed (3 downto 0));
+end issue1;
+
+architecture beh of issue1 is
+begin
+    foobar <= to_signed(natural'(-1), foobar'length);
+end architecture;
diff --git a/testsuite/synth/issue1240/issue2.vhdl b/testsuite/synth/issue1240/issue2.vhdl
new file mode 100644
index 000000000..7e9f9032a
--- /dev/null
+++ b/testsuite/synth/issue1240/issue2.vhdl
@@ -0,0 +1,13 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity issue2 is
+    port (foobar : out signed (3 downto 0));
+end issue2;
+
+architecture beh of issue2 is
+    subtype my_type is natural range 0 to 1; -- width = 1
+begin
+    foobar <= to_signed(my_type'(-15), foobar'length);
+end architecture;
diff --git a/testsuite/synth/issue1240/issue3.vhdl b/testsuite/synth/issue1240/issue3.vhdl
new file mode 100644
index 000000000..85410cc0e
--- /dev/null
+++ b/testsuite/synth/issue1240/issue3.vhdl
@@ -0,0 +1,17 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity issue3 is
+    port (foo   : in  integer;
+         foobar : out signed (3 downto 0));
+end issue3;
+
+architecture beh of issue3 is
+    subtype n_int is integer range -1 to 1;
+begin
+    with n_int'(foo) select
+        foobar <= signed'("0001") when -1,
+                  signed'("0010") when  0,
+                  signed'("0011") when  1;
+end architecture;
diff --git a/testsuite/synth/issue1240/testsuite.sh b/testsuite/synth/issue1240/testsuite.sh
new file mode 100755
index 000000000..f63808fcc
--- /dev/null
+++ b/testsuite/synth/issue1240/testsuite.sh
@@ -0,0 +1,10 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+synth_failure issue1.vhdl -e
+synth_failure issue2.vhdl -e
+
+clean
+
+echo "Test successful"