209                 exact: "foobar".to_owned(),  in value()
215                     .exact("foobar".to_owned())  in value()
274                 exact: "foobar".to_owned(),  in mandatory_constraints()
282                 exact: vec![FacingMode::user(), FacingMode::environment()]  in mandatory_constraints()
291                         .exact("foobar".to_owned())  in mandatory_constraints()
307                         .exact(vec![FacingMode::user(), FacingMode::environment()]),  in mandatory_constraints()
321                     exact: "foobar".to_owned(),  in advanced_constraints()
333                     exact: vec![FacingMode::user(), FacingMode::environment()]  in advanced_constraints()
342                     .exact("foobar".to_owned())  in advanced_constraints()
356                     .exact(vec![FacingMode::user(), FacingMode::environment()])  in advanced_constraints()
369                     exact: "foobar".to_owned(),  in constraints()
377                     exact: vec![FacingMode::user(), FacingMode::environment()]  in constraints()
383                         exact: "foobar".to_owned(),  in constraints()
395                         exact: vec![FacingMode::user(), FacingMode::environment()]  in constraints()
406                         .exact("foobar".to_owned())  in constraints()
420                         .exact(vec![FacingMode::user(), FacingMode::environment()])  in constraints()
428                         .exact("foobar".to_owned())  in constraints()
442                         .exact(vec![FacingMode::user(), FacingMode::environment()])  in constraints()