tests/ui/traits/suggest-where-clause.stderr

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