Verify shared debug binding implementation

flag_aliases_test.go

@@ -325,9 +325,16 @@ func TestSharedDebugDeclarationValidation(t *testing.T) {
 		{BoolFlag[struct{}](FlagMeta{Name: "debug"}, false, nil)},
 		{BoolFlag(FlagMeta{Name: "debug", Short: "h"}, false, func(*struct{}, Supplied[bool]) {})},
 		{ValueFlag(FlagMeta{Name: "debug"}, (*bool)(nil), strconv.ParseBool, func(*struct{}, Supplied[bool]) {})},
+		{OccurrenceFlag(FlagMeta{Name: "debug"}, strconv.ParseBool, func(*struct{}, Supplied[bool]) {})},
 	} {
 		if _, err := New(Identity{Name: "Example"}, flagAliasCommand("bad", flags...)); err == nil {
 			t.Fatalf("invalid binding accepted: %#v", flags)
 		}
 	}
+	for _, name := range []string{"quiet", "verbose", "progress", "format"} {
+		flag := BoolFlag(FlagMeta{Name: name}, false, func(*struct{}, Supplied[bool]) {})
+		if _, err := New(Identity{Name: "Example"}, flagAliasCommand("bad", flag)); err == nil {
+			t.Errorf("reserved boolean --%s was accepted", name)
+		}
+	}
 }