Add link to book for Sized errors

Author: estebank

src/libcore/marker.rs

@@ -93,7 +93,9 @@ impl<T: ?Sized> !Send for *mut T { }
 #[lang = "sized"]
 #[rustc_on_unimplemented(
     message="`{Self}` does not have a constant size known at compile-time",
-    label="`{Self}` does not have a constant size known at compile-time"
+    label="`{Self}` does not have a constant size known at compile-time",
+    note="to learn more, visit <https://doc.rust-lang.org/book/second-edition/\
+          ch19-04-advanced-types.html#dynamically-sized-types--sized>",
 )]
 #[fundamental] // for Default, for example, which requires that `[T]: !Default` be evaluatable
 pub trait Sized {

src/test/ui/const-unsized.stderr

@@ -5,6 +5,7 @@ LL | const CONST_0: Debug+Sync = *(&0 as &(Debug+Sync));
    |                             ^^^^^^^^^^^^^^^^^^^^^^ `std::fmt::Debug + std::marker::Sync + 'static` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `std::fmt::Debug + std::marker::Sync + 'static`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: constant expressions must have a statically known size
 
 error[E0277]: `str` does not have a constant size known at compile-time
@@ -14,6 +15,7 @@ LL | const CONST_FOO: str = *"foo";
    |                        ^^^^^^ `str` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `str`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: constant expressions must have a statically known size
 
 error[E0277]: `std::fmt::Debug + std::marker::Sync + 'static` does not have a constant size known at compile-time
@@ -23,6 +25,7 @@ LL | static STATIC_1: Debug+Sync = *(&1 as &(Debug+Sync));
    |                               ^^^^^^^^^^^^^^^^^^^^^^ `std::fmt::Debug + std::marker::Sync + 'static` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `std::fmt::Debug + std::marker::Sync + 'static`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: constant expressions must have a statically known size
 
 error[E0277]: `str` does not have a constant size known at compile-time
@@ -32,6 +35,7 @@ LL | static STATIC_BAR: str = *"bar";
    |                          ^^^^^^ `str` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `str`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: constant expressions must have a statically known size
 
 error: aborting due to 4 previous errors

src/test/ui/error-codes/E0277.stderr

@@ -5,6 +5,7 @@ LL | fn f(p: Path) { }
    |      ^ `[u8]` does not have a constant size known at compile-time
    |
    = help: within `std::path::Path`, the trait `std::marker::Sized` is not implemented for `[u8]`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: required because it appears within the type `std::path::Path`
    = note: all local variables must have a statically known size
 

src/test/ui/feature-gate-trivial_bounds.stderr

@@ -94,6 +94,7 @@ LL | struct TwoStrs(str, str) where str: Sized; //~ ERROR
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `str` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `str`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = help: see issue #48214
    = help: add #![feature(trivial_bounds)] to the crate attributes to enable
 
@@ -106,6 +107,7 @@ LL | | }
    | |_^ `A + 'static` does not have a constant size known at compile-time
    |
    = help: within `Dst<A + 'static>`, the trait `std::marker::Sized` is not implemented for `A + 'static`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: required because it appears within the type `Dst<A + 'static>`
    = help: see issue #48214
    = help: add #![feature(trivial_bounds)] to the crate attributes to enable
@@ -119,6 +121,7 @@ LL | | }
    | |_^ `str` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `str`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = help: see issue #48214
    = help: add #![feature(trivial_bounds)] to the crate attributes to enable
 

src/test/ui/generator/sized-yield.stderr

@@ -9,6 +9,7 @@ LL | |    };
    | |____^ `str` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `str`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: the yield type of a generator must have a statically known size
 
 error[E0277]: `str` does not have a constant size known at compile-time
@@ -18,6 +19,7 @@ LL |    unsafe { gen.resume(); }
    |                 ^^^^^^ `str` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `str`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
 
 error: aborting due to 2 previous errors
 

src/test/ui/mismatched_types/cast-rfc0401.stderr

@@ -223,6 +223,7 @@ LL |     let _ = fat_v as *const Foo; //~ ERROR `[u8]` does not have a constant
    |             ^^^^^ `[u8]` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `[u8]`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: required for the cast to the object type `Foo`
 
 error[E0277]: `str` does not have a constant size known at compile-time
@@ -232,6 +233,7 @@ LL |     let _ = a as *const Foo; //~ ERROR `str` does not have a constant size
    |             ^ `str` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `str`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: required for the cast to the object type `Foo`
 
 error[E0606]: casting `&{float}` as `f32` is invalid

src/test/ui/resolve/issue-5035-2.stderr

@@ -5,6 +5,7 @@ LL | fn foo(_x: K) {}
    |        ^^ `I + 'static` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `I + 'static`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: all local variables must have a statically known size
 
 error: aborting due to previous error

src/test/ui/suggestions/str-array-assignment.stderr

@@ -28,6 +28,7 @@ LL |   let v = s[..2];
    |       `str` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `str`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: all local variables must have a statically known size
 
 error[E0308]: mismatched types

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

@@ -5,6 +5,7 @@ LL |     mem::size_of::<U>();
    |     ^^^^^^^^^^^^^^^^^ `U` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `U`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = help: consider adding a `where U: std::marker::Sized` bound
    = note: required by `std::mem::size_of`
 
@@ -15,6 +16,7 @@ LL |     mem::size_of::<Misc<U>>();
    |     ^^^^^^^^^^^^^^^^^^^^^^^ `U` does not have a constant size known at compile-time
    |
    = help: within `Misc<U>`, the trait `std::marker::Sized` is not implemented for `U`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = help: consider adding a `where U: std::marker::Sized` bound
    = note: required because it appears within the type `Misc<U>`
    = note: required by `std::mem::size_of`
@@ -52,6 +54,7 @@ LL |     mem::size_of::<[T]>();
    |     ^^^^^^^^^^^^^^^^^^^ `[T]` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `[T]`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: required by `std::mem::size_of`
 
 error[E0277]: `[&U]` does not have a constant size known at compile-time
@@ -61,6 +64,7 @@ LL |     mem::size_of::<[&U]>();
    |     ^^^^^^^^^^^^^^^^^^^^ `[&U]` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `[&U]`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = note: required by `std::mem::size_of`
 
 error: aborting due to 7 previous errors

src/test/ui/union/union-sized-field.stderr

@@ -5,6 +5,7 @@ LL |     value: T,
    |     ^^^^^^^^ `T` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `T`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = help: consider adding a `where T: std::marker::Sized` bound
    = note: no field of a union may have a dynamically sized type
 
@@ -15,6 +16,7 @@ LL |     value: T,
    |     ^^^^^^^^ `T` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `T`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = help: consider adding a `where T: std::marker::Sized` bound
    = note: only the last field of a struct may have a dynamically sized type
 
@@ -25,6 +27,7 @@ LL |     Value(T),
    |           ^ `T` does not have a constant size known at compile-time
    |
    = help: the trait `std::marker::Sized` is not implemented for `T`
+   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
    = help: consider adding a `where T: std::marker::Sized` bound
    = note: no field of an enum variant may have a dynamically sized type