ident: member interface

For representing full identifiers of system and member.

Signed-off-by: Yonah <contrib@gensokyo.uk>

ident/ident_test.go

@@ -69,7 +69,7 @@ func (testCases rTestCases[V, S]) run(t *testing.T) {
 				}
 
 				if got := S(&tc.ident).String(); got != string(tc.want) {
-					t.Errorf("String: %#v, want %#v", []byte(got), tc.want)
+					t.Errorf("String: %s, want %s", got, tc.want)
 				}
 			})
 		})