Add regression test for enum items shadowing type identifiers

Check that enum item names can shadow visible type identifiers. Cover plain enum
items as well as the counted and ranged enum item sequence forms.

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

ivtest/ivltests/sv_type_identifier_enum_item_name.v

@@ -0,0 +1,40 @@
+// Check that enum item names can shadow visible type identifiers.
+
+typedef int T;
+typedef int U;
+typedef int V;
+
+module test;
+
+  reg failed;
+
+  `define check(value, expected, error) \
+    if ((value) !== (expected)) begin \
+      $display("FAILED(%0d). %s", `__LINE__, error); \
+      $display("  expected %0h, got %0h", expected, value); \
+      failed = 1'b1; \
+    end
+
+  enum {
+    T = 3,
+    U[2] = 5,
+    V[3:4] = 9
+  } e;
+
+  initial begin
+    failed = 1'b0;
+
+    e = T;
+
+    `check(e, 3, "Enum item name did not hide typedef");
+    `check(U0, 5, "Enum item sequence name did not hide typedef");
+    `check(U1, 6, "Enum item sequence value mismatch");
+    `check(V3, 9, "Enum item range name did not hide typedef");
+    `check(V4, 10, "Enum item range value mismatch");
+
+    if (!failed) begin
+      $display("PASSED");
+    end
+  end
+
+endmodule

ivtest/regress-vvp.list

@@ -386,6 +386,7 @@ sv_soft_packed_union_fail1	vvp_tests/sv_soft_packed_union_fail1.json
 sv_super_member_fail		vvp_tests/sv_super_member_fail.json
 sv_type_identifier_ams_name_fields	vvp_tests/sv_type_identifier_ams_name_fields.json
 sv_type_identifier_config_name	vvp_tests/sv_type_identifier_config_name.json
+sv_type_identifier_enum_item_name	vvp_tests/sv_type_identifier_enum_item_name.json
 sv_type_identifier_foreach_name	vvp_tests/sv_type_identifier_foreach_name.json
 sv_type_identifier_genvar_name	vvp_tests/sv_type_identifier_genvar_name.json
 sv_type_identifier_modport_name	vvp_tests/sv_type_identifier_modport_name.json

ivtest/vvp_tests/sv_type_identifier_enum_item_name.json

@@ -0,0 +1,9 @@
+{
+    "type"          : "normal",
+    "source"        : "sv_type_identifier_enum_item_name.v",
+    "iverilog-args" : [ "-g2005-sv" ],
+    "vlog95" : {
+        "__comment"     : "Enums are SystemVerilog",
+        "type"          : "CE"
+    }
+}