Ensure that warning about variable shadowing mentions fields correctly

Author: leonerd

pad.c

@@ -899,6 +899,7 @@ S_pad_check_dup(pTHX_ PADNAME *name, U32 flags, const HV *ourstash)
                 (   is_our                         ? "our"   :
                     PL_parser->in_my == KEY_my     ? "my"    :
                     PL_parser->in_my == KEY_sigvar ? "my"    :
+                    PL_parser->in_my == KEY_field  ? "field" :
                                                      "state" ),
                 *PadnamePV(pn) == '&' ? "subroutine" : "variable",
                 PNfARG(pn),

t/lib/warnings/class

@@ -22,3 +22,14 @@ C->new(1,2,3);
 EXPECT
 Odd number of arguments passed to C constructor at - line 7.
 Odd number of arguments passed to C constructor at - line 9.
+########
+# field shadowing warning
+use v5.36;
+use feature 'class';
+no warnings 'experimental::class';
+class C {
+  field $x;
+  field $x;
+}
+EXPECT
+"field" variable $x masks earlier declaration in same scope at - line 7.