src/libsyntax/diagnostic_list.rs

// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![allow(non_snake_case)]

// Error messages for EXXXX errors.
// Each message should start and end with a new line, and be wrapped to 80 characters.
// In vim you can `:set tw=80` and use `gq` to wrap paragraphs. Use `:set tw=0` to disable.
register_long_diagnostics! {

E0178: r##"
In types, the `+` type operator has low precedence, so it is often necessary
to use parentheses.

For example:

```compile_fail,E0178
trait Foo {}

struct Bar<'a> {
    w: &'a Foo + Copy,   // error, use &'a (Foo + Copy)
    x: &'a Foo + 'a,     // error, use &'a (Foo + 'a)
    y: &'a mut Foo + 'a, // error, use &'a mut (Foo + 'a)
    z: fn() -> Foo + 'a, // error, use fn() -> (Foo + 'a)
}
```

More details can be found in [RFC 438].

[RFC 438]: https://github.com/rust-lang/rfcs/pull/438
"##,

E0534: r##"
The `inline` attribute was malformed.

Erroneous code example:

```ignore (compile_fail not working here; see Issue #43707)
#[inline()] // error: expected one argument
pub fn something() {}

fn main() {}
```

The parenthesized `inline` attribute requires the parameter to be specified:

```
#[inline(always)]
fn something() {}
```

or:

```
#[inline(never)]
fn something() {}
```

Alternatively, a paren-less version of the attribute may be used to hint the
compiler about inlining opportunity:

```
#[inline]
fn something() {}
```

For more information about the inline attribute, read:
https://doc.rust-lang.org/reference.html#inline-attributes
"##,

E0535: r##"
An unknown argument was given to the `inline` attribute.

Erroneous code example:

```ignore (compile_fail not working here; see Issue #43707)
#[inline(unknown)] // error: invalid argument
pub fn something() {}

fn main() {}
```

The `inline` attribute only supports two arguments:

 * always
 * never

All other arguments given to the `inline` attribute will return this error.
Example:

```
#[inline(never)] // ok!
pub fn something() {}

fn main() {}
```

For more information about the inline attribute, https:
read://doc.rust-lang.org/reference.html#inline-attributes
"##,

E0536: r##"
The `not` cfg-predicate was malformed.

Erroneous code example:

```compile_fail,E0536
#[cfg(not())] // error: expected 1 cfg-pattern
pub fn something() {}

pub fn main() {}
```

The `not` predicate expects one cfg-pattern. Example:

```
#[cfg(not(target_os = "linux"))] // ok!
pub fn something() {}

pub fn main() {}
```

For more information about the cfg attribute, read:
https://doc.rust-lang.org/reference.html#conditional-compilation
"##,

E0537: r##"
An unknown predicate was used inside the `cfg` attribute.

Erroneous code example:

```compile_fail,E0537
#[cfg(unknown())] // error: invalid predicate `unknown`
pub fn something() {}

pub fn main() {}
```

The `cfg` attribute supports only three kinds of predicates:

 * any
 * all
 * not

Example:

```
#[cfg(not(target_os = "linux"))] // ok!
pub fn something() {}

pub fn main() {}
```

For more information about the cfg attribute, read:
https://doc.rust-lang.org/reference.html#conditional-compilation
"##,

E0552: r##"
A unrecognized representation attribute was used.

Erroneous code example:

```compile_fail,E0552
#[repr(D)] // error: unrecognized representation hint
struct MyStruct {
    my_field: usize
}
```

You can use a `repr` attribute to tell the compiler how you want a struct or
enum to be laid out in memory.

Make sure you're using one of the supported options:

```
#[repr(C)] // ok!
struct MyStruct {
    my_field: usize
}
```

For more information about specifying representations, see the ["Alternative
Representations" section] of the Rustonomicon.

["Alternative Representations" section]: https://doc.rust-lang.org/nomicon/other-reprs.html
"##,

E0554: r##"
Feature attributes are only allowed on the nightly release channel. Stable or
beta compilers will not comply.

Example of erroneous code (on a stable compiler):

```ignore (depends on release channel)
#![feature(non_ascii_idents)] // error: #![feature] may not be used on the
                              //        stable release channel
```

If you need the feature, make sure to use a nightly release of the compiler
(but be warned that the feature may be removed or altered in the future).
"##,

E0557: r##"
A feature attribute named a feature that has been removed.

Erroneous code example:

```compile_fail,E0557
#![feature(managed_boxes)] // error: feature has been removed
```

Delete the offending feature attribute.
"##,

E0565: r##"
A literal was used in an attribute that doesn't support literals.

Erroneous code example:

```ignore (compile_fail not working here; see Issue #43707)
#![feature(attr_literals)]

#[inline("always")] // error: unsupported literal
pub fn something() {}
```

Literals in attributes are new and largely unsupported. Work to support literals
where appropriate is ongoing. Try using an unquoted name instead:

```
#[inline(always)]
pub fn something() {}
```
"##,

E0583: r##"
A file wasn't found for an out-of-line module.

Erroneous code example:

```ignore (compile_fail not working here; see Issue #43707)
mod file_that_doesnt_exist; // error: file not found for module

fn main() {}
```

Please be sure that a file corresponding to the module exists. If you
want to use a module named `file_that_doesnt_exist`, you need to have a file
named `file_that_doesnt_exist.rs` or `file_that_doesnt_exist/mod.rs` in the
same directory.
"##,

E0585: r##"
A documentation comment that doesn't document anything was found.

Erroneous code example:

```compile_fail,E0585
fn main() {
    // The following doc comment will fail:
    /// This is a useless doc comment!
}
```

Documentation comments need to be followed by items, including functions,
types, modules, etc. Examples:

```
/// I'm documenting the following struct:
struct Foo;

/// I'm documenting the following function:
fn foo() {}
```
"##,

E0586: r##"
An inclusive range was used with no end.

Erroneous code example:

```compile_fail,E0586
#![feature(inclusive_range_syntax)]

fn main() {
    let tmp = vec![0, 1, 2, 3, 4, 4, 3, 3, 2, 1];
    let x = &tmp[1..=]; // error: inclusive range was used with no end
}
```

An inclusive range needs an end in order to *include* it. If you just need a
start and no end, use a non-inclusive range (with `..`):

```
fn main() {
    let tmp = vec![0, 1, 2, 3, 4, 4, 3, 3, 2, 1];
    let x = &tmp[1..]; // ok!
}
```

Or put an end to your inclusive range:

```
#![feature(inclusive_range_syntax)]

fn main() {
    let tmp = vec![0, 1, 2, 3, 4, 4, 3, 3, 2, 1];
    let x = &tmp[1..=3]; // ok!
}
```
"##,

E0658: r##"
An unstable feature was used.

Erroneous code example:

```compile_fail,E658
let x = ::std::u128::MAX; // error: use of unstable library feature 'i128'
```

If you're using a stable or a beta version of rustc, you won't be able to use
any unstable features. In order to do so, please switch to a nightly version of
rustc (by using rustup).

If you're using a nightly version of rustc, just add the corresponding feature
to be able to use it:

```
#![feature(i128)]

fn main() {
    let x = ::std::u128::MAX; // ok!
}
```
"##,

}

register_diagnostics! {
    E0538, // multiple [same] items
    E0539, // incorrect meta item
    E0540, // multiple rustc_deprecated attributes
    E0541, // unknown meta item
    E0542, // missing 'since'
    E0543, // missing 'reason'
    E0544, // multiple stability levels
    E0545, // incorrect 'issue'
    E0546, // missing 'feature'
    E0547, // missing 'issue'
    E0548, // incorrect stability attribute type
    E0549, // rustc_deprecated attribute must be paired with either stable or unstable attribute
    E0550, // multiple deprecated attributes
    E0551, // incorrect meta item
    E0553, // multiple rustc_const_unstable attributes
    E0555, // malformed feature attribute, expected #![feature(...)]
    E0556, // malformed feature, expected just one word
    E0584, // file for module `..` found at both .. and ..
    E0589, // invalid `repr(align)` attribute
    E0629, // missing 'feature' (rustc_const_unstable)
    E0630, // rustc_const_unstable attribute must be paired with stable/unstable attribute
}