Add regression test for nested class method calls

Check that an unqualified method call from a named block uses the implicit
`this` signal from the containing class method. The compiler currently looks
for the signal in the named-block scope and crashes.

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

ivtest/ivltests/sv_class_nested_method_call.v

@@ -0,0 +1,30 @@
+// Check that an unqualified class method call works from a named block in
+// another method.
+
+module test;
+
+  class C;
+    function int get_value();
+      return 1;
+    endfunction
+
+    function int call_method();
+      begin : nested
+        return get_value();
+      end
+    endfunction
+  endclass
+
+  C object;
+
+  initial begin
+    object = new;
+
+    if (object.call_method() != 1) begin
+      $display("FAILED");
+    end else begin
+      $display("PASSED");
+    end
+  end
+
+endmodule

ivtest/regress-vvp.list

@@ -285,6 +285,7 @@ sv_chained_constructor2		vvp_tests/sv_chained_constructor2.json
 sv_chained_constructor3		vvp_tests/sv_chained_constructor3.json
 sv_chained_constructor4		vvp_tests/sv_chained_constructor4.json
 sv_chained_constructor5		vvp_tests/sv_chained_constructor5.json
+sv_class_nested_method_call	vvp_tests/sv_class_nested_method_call.json
 sv_class_prop_assign_op1	vvp_tests/sv_class_prop_assign_op1.json
 sv_class_prop_assign_op2	vvp_tests/sv_class_prop_assign_op2.json
 sv_class_prop_class_name	vvp_tests/sv_class_prop_class_name.json

ivtest/vvp_tests/sv_class_nested_method_call.json

@@ -0,0 +1,9 @@
+{
+    "type"          : "normal",
+    "source"        : "sv_class_nested_method_call.v",
+    "iverilog-args" : [ "-g2005-sv" ],
+    "vlog95" : {
+        "__comment"     : "Classes are not supported",
+        "type"          : "CE"
+    }
+}