Add regression test for imported typedef reference order

Check that a typedef reference in a nested scope keeps the package typedef
selected during parsing when another typedef with the same name is imported
later. Check that a reference following the import selects the new typedef.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

ivtest/ivltests/sv_package_import_order_typedef.v

@@ -0,0 +1,39 @@
+// Check package import ordering for types in nested scopes.
+
+package p1;
+  typedef logic [1:0] type_t;
+endpackage
+
+package p2;
+  typedef logic [3:0] type_t;
+endpackage
+
+module test;
+
+  import p1::type_t;
+
+  reg failed;
+
+  `define check(val, exp) \
+    if (val !== exp) begin \
+      $display("FAILED(%0d). '%s' expected %b, got %b", `__LINE__, \
+               `"val`", exp, val); \
+      failed = 1'b1; \
+    end
+
+  initial begin : b
+    type_t value_before;
+    import p2::type_t;
+    type_t value_after;
+
+    failed = 1'b0;
+
+    `check($bits(value_before), 2);
+    `check($bits(value_after), 4);
+
+    if (!failed) begin
+      $display("PASSED");
+    end
+  end
+
+endmodule

ivtest/regress-vvp.list

@@ -399,6 +399,7 @@ sv_module_port3			vvp_tests/sv_module_port3.json
 sv_module_port4			vvp_tests/sv_module_port4.json
 sv_net_array_decl_assign	vvp_tests/sv_net_array_decl_assign.json
 sv_net_decl_assign		vvp_tests/sv_net_decl_assign.json
+sv_package_import_order_typedef	vvp_tests/sv_package_import_order_typedef.json
 sv_package_lifetime		vvp_tests/sv_package_lifetime.json
 sv_package_lifetime_fail	vvp_tests/sv_package_lifetime_fail.json
 parameter_omit1			vvp_tests/parameter_omit1.json

ivtest/vvp_tests/sv_package_import_order_typedef.json

@@ -0,0 +1,5 @@
+{
+    "type"          : "normal",
+    "source"        : "sv_package_import_order_typedef.v",
+    "iverilog-args" : [ "-g2005-sv" ]
+}