src/test/ui/traits/trait-suggest-where-clause.stderr

   1 error[E0277]: the size for values of type `U` cannot be known at compilation time
   2   --> $DIR/trait-suggest-where-clause.rs:8:20
   3    |
   4 LL | fn check<T: Iterator, U: ?Sized>() {
   5    |                       -- help: consider further restricting this bound: `U: std::marker::Sized +`
   6 LL |     // suggest a where-clause, if needed
   7 LL |     mem::size_of::<U>();
   8    |                    ^ doesn't have a size known at compile-time
   9    |
  10   ::: $SRC_DIR/libcore/mem/mod.rs:LL:COL
  11    |
  12 LL | pub const fn size_of<T>() -> usize {
  13    |                      - required by this bound in `std::mem::size_of`
  14    |
  15    = help: the trait `std::marker::Sized` is not implemented for `U`
  16    = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
  17
  18 error[E0277]: the size for values of type `U` cannot be known at compilation time
  19   --> $DIR/trait-suggest-where-clause.rs:11:5
  20    |
  21 LL | fn check<T: Iterator, U: ?Sized>() {
  22    |                       -- help: consider further restricting this bound: `U: std::marker::Sized +`
  23 ...
  24 LL |     mem::size_of::<Misc<U>>();
  25    |     ^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
  26    |
  27   ::: $SRC_DIR/libcore/mem/mod.rs:LL:COL
  28    |
  29 LL | pub const fn size_of<T>() -> usize {
  30    |                      - required by this bound in `std::mem::size_of`
  31    |
  32    = help: within `Misc<U>`, the trait `std::marker::Sized` is not implemented for `U`
  33    = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
  34    = note: required because it appears within the type `Misc<U>`
  35
  36 error[E0277]: the trait bound `u64: std::convert::From<T>` is not satisfied
  37   --> $DIR/trait-suggest-where-clause.rs:16:5
  38    |
  39 LL |     <u64 as From<T>>::from;
  40    |     ^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::From<T>` is not implemented for `u64`
  41    |
  42    = note: required by `std::convert::From::from`
  43
  44 error[E0277]: the trait bound `u64: std::convert::From<<T as std::iter::Iterator>::Item>` is not satisfied
  45   --> $DIR/trait-suggest-where-clause.rs:19:5
  46    |
  47 LL |     <u64 as From<<T as Iterator>::Item>>::from;
  48    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::From<<T as std::iter::Iterator>::Item>` is not implemented for `u64`
  49    |
  50    = note: required by `std::convert::From::from`
  51
  52 error[E0277]: the trait bound `Misc<_>: std::convert::From<T>` is not satisfied
  53   --> $DIR/trait-suggest-where-clause.rs:24:5
  54    |
  55 LL |     <Misc<_> as From<T>>::from;
  56    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::From<T>` is not implemented for `Misc<_>`
  57    |
  58    = note: required by `std::convert::From::from`
  59
  60 error[E0277]: the size for values of type `[T]` cannot be known at compilation time
  61   --> $DIR/trait-suggest-where-clause.rs:29:20
  62    |
  63 LL |     mem::size_of::<[T]>();
  64    |                    ^^^ doesn't have a size known at compile-time
  65    |
  66   ::: $SRC_DIR/libcore/mem/mod.rs:LL:COL
  67    |
  68 LL | pub const fn size_of<T>() -> usize {
  69    |                      - required by this bound in `std::mem::size_of`
  70    |
  71    = help: the trait `std::marker::Sized` is not implemented for `[T]`
  72    = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
  73
  74 error[E0277]: the size for values of type `[&U]` cannot be known at compilation time
  75   --> $DIR/trait-suggest-where-clause.rs:32:5
  76    |
  77 LL |     mem::size_of::<[&U]>();
  78    |     ^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
  79    |
  80   ::: $SRC_DIR/libcore/mem/mod.rs:LL:COL
  81    |
  82 LL | pub const fn size_of<T>() -> usize {
  83    |                      - required by this bound in `std::mem::size_of`
  84    |
  85    = help: the trait `std::marker::Sized` is not implemented for `[&U]`
  86    = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
  87
  88 error: aborting due to 7 previous errors
  89
  90 For more information about this error, try `rustc --explain E0277`.