3 files changed, 40 insertions, 0 deletions
diff --git a/testsuite/synth/issue1177/issue1.vhdl b/testsuite/synth/issue1177/issue1.vhdl
new file mode 100644
index 000000000..5d18a0f57
--- /dev/null
+++ b/testsuite/synth/issue1177/issue1.vhdl
@@ -0,0 +1,15 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity issue1 is
+    port (foo : in  std_logic;
+          bar : out boolean);
+end issue1;
+
+architecture behav of issue1 is
+begin
+
+    bar <= (?? foo);
+
+end architecture;
+
diff --git a/testsuite/synth/issue1177/issue2.vhdl b/testsuite/synth/issue1177/issue2.vhdl
new file mode 100644
index 000000000..efe94ddd9
--- /dev/null
+++ b/testsuite/synth/issue1177/issue2.vhdl
@@ -0,0 +1,15 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity issue2 is
+    port (foo : in  std_logic;
+          bar : out boolean);
+end issue2;
+
+architecture behav of issue2 is
+begin
+
+  --bar <= true when (?? foo) else false; -- works
+    bar <= true when false xor (?? foo) else false;
+
+end architecture;
diff --git a/testsuite/synth/issue1177/testsuite.sh b/testsuite/synth/issue1177/testsuite.sh
new file mode 100755
index 000000000..8cbfe93fd
--- /dev/null
+++ b/testsuite/synth/issue1177/testsuite.sh
@@ -0,0 +1,10 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+GHDL_STD_FLAGS=--std=08
+synth_analyze issue1
+synth_analyze issue2
+
+clean
+echo "Test successful"