|  | error[E0261]: use of undeclared lifetime name `'a` | 
|  | --> $DIR/method-call-lifetime-args-unresolved.rs:2:15 | 
|  | | | 
|  | LL |     0.clone::<'a>(); | 
|  | |               ^^ undeclared lifetime | 
|  | | | 
|  | help: consider introducing lifetime `'a` here | 
|  | | | 
|  | LL | fn main<'a>() { | 
|  | |        ++++ | 
|  |  | 
|  | warning: cannot specify lifetime arguments explicitly if late bound lifetime parameters are present | 
|  | --> $DIR/method-call-lifetime-args-unresolved.rs:2:15 | 
|  | | | 
|  | LL |     0.clone::<'a>(); | 
|  | |               ^^ | 
|  | | | 
|  | --> $SRC_DIR/core/src/clone.rs:LL:COL | 
|  | | | 
|  | = note: the late bound lifetime parameter is introduced here | 
|  | | | 
|  | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! | 
|  | = note: for more information, see issue #42868 <https://github.com/rust-lang/rust/issues/42868> | 
|  | = note: `#[warn(late_bound_lifetime_arguments)]` (part of `#[warn(future_incompatible)]`) on by default | 
|  |  | 
|  | error: aborting due to 1 previous error; 1 warning emitted | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0261`. |