| @@ -2643,14 +2643,54 @@ impl ToString for i8 { |
|
|
| 2643 |
2643 |
} |
| 2644 |
2644 |
} |
| 2645 |
2645 |
|
| 2646 |
|
-#[doc(hidden)] |
|
2646 |
+// Generic/generated code can sometimes have multiple, nested references |
|
2647 |
+// for strings, including `&&&str`s that would never be written |
|
2648 |
+// by hand. This macro generates twelve layers of nested `&`-impl |
|
2649 |
+// for primitive strings. |
| 2647 |
2650 |
#[cfg(not(no_global_oom_handling))] |
| 2648 |
|
-#[stable(feature = "str_to_string_specialization", since = "1.9.0")] |
| 2649 |
|
-impl ToString for str { |
| 2650 |
|
-#[inline] |
| 2651 |
|
-fn to_string(&self) -> String { |
| 2652 |
|
-String::from(self) |
| 2653 |
|
-} |
|
2651 |
+macro_rules! to_string_str_wrap_in_ref { |
|
2652 |
+{x (((x:ident)*} => { |
|
2653 |
+&to_string_str_wrap_in_ref! { (((x)* } |
|
2654 |
+}; |
|
2655 |
+{} => { str }; |
|
2656 |
+} |
|
2657 |
+#[cfg(not(no_global_oom_handling))] |
|
2658 |
+macro_rules! to_string_expr_wrap_in_deref { |
|
2659 |
+{$self:expr ; x (((x:ident)*} => { |
|
2660 |
+*(to_string_expr_wrap_in_deref! { self;self ; self;($x)* }) |
|
2661 |
+}; |
|
2662 |
+{$self:expr ;} => { $self }; |
|
2663 |
+} |
|
2664 |
+#[cfg(not(no_global_oom_handling))] |
|
2665 |
+macro_rules! to_string_str { |
|
2666 |
+{$($($x:ident)*),+} => { |
|
2667 |
+ $( |
|
2668 |
+ #[doc(hidden)] |
|
2669 |
+ #[stable(feature = "str_to_string_specialization", since = "1.9.0")] |
|
2670 |
+impl ToString for to_string_str_wrap_in_ref!($($x)*) { |
|
2671 |
+ #[inline] |
|
2672 |
+fn to_string(&self) -> String { |
|
2673 |
+String::from(to_string_expr_wrap_in_deref!(self ; (((x)*)) |
|
2674 |
+} |
|
2675 |
+} |
|
2676 |
+)+ |
|
2677 |
+}; |
|
2678 |
+} |
|
2679 |
+ |
|
2680 |
+#[cfg(not(no_global_oom_handling))] |
|
2681 |
+to_string_str! { |
|
2682 |
+ x x x x x x x x x x x x, |
|
2683 |
+ x x x x x x x x x x x, |
|
2684 |
+ x x x x x x x x x x, |
|
2685 |
+ x x x x x x x x x, |
|
2686 |
+ x x x x x x x x, |
|
2687 |
+ x x x x x x x, |
|
2688 |
+ x x x x x x, |
|
2689 |
+ x x x x x, |
|
2690 |
+ x x x x, |
|
2691 |
+ x x x, |
|
2692 |
+ x x, |
|
2693 |
+ x, |
| 2654 |
2694 |
} |
| 2655 |
2695 |
|
| 2656 |
2696 |
#[doc(hidden)] |