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Unification and cleanup of librustc_mir error codes
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@GuillaumeGomez
GuillaumeGomez committed Oct 14, 2019
1 parent c6de3eb commit 6545819
Showing 1 changed file with 92 additions and 50 deletions.
142 changes: 92 additions & 50 deletions src/librustc_mir/error_codes.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -64,7 +64,9 @@ E0004: r##"
This error indicates that the compiler cannot guarantee a matching pattern for
one or more possible inputs to a match expression. Guaranteed matches are
required in order to assign values to match expressions, or alternatively,
determine the flow of execution. Erroneous code example:
determine the flow of execution.
Erroneous code example:
```compile_fail,E0004
enum Terminator {
Expand Down Expand Up @@ -109,7 +111,9 @@ match x {

E0005: r##"
Patterns used to bind names must be irrefutable, that is, they must guarantee
that a name will be extracted in all cases. Erroneous code example:
that a name will be extracted in all cases.
Erroneous code example:
```compile_fail,E0005
let x = Some(1);
Expand Down Expand Up @@ -145,6 +149,8 @@ like the following is invalid as it requires the entire `Option<String>` to be
moved into a variable called `op_string` while simultaneously requiring the
inner `String` to be moved into a variable called `s`.
Erroneous code example:
```compile_fail,E0007
let x = Some("s".to_string());
Expand Down Expand Up @@ -211,8 +217,9 @@ match x {
E0010: r##"
The value of statics and constants must be known at compile time, and they live
for the entire lifetime of a program. Creating a boxed value allocates memory on
the heap at runtime, and therefore cannot be done at compile time. Erroneous
code example:
the heap at runtime, and therefore cannot be done at compile time.
Erroneous code example:
```compile_fail,E0010
#![feature(box_syntax)]
Expand All @@ -223,15 +230,17 @@ const CON : Box<i32> = box 0;

E0013: r##"
Static and const variables can refer to other const variables. But a const
variable cannot refer to a static variable. For example, `Y` cannot refer to
`X` here:
variable cannot refer to a static variable.
Erroneous code example:
```compile_fail,E0013
static X: i32 = 42;
const Y: i32 = X;
```
To fix this, the value can be extracted as a const and then used:
In this example, `Y` cannot refer to `X` here. To fix this, the value can be
extracted as a const and then used:
```
const A: i32 = 42;
Expand Down Expand Up @@ -260,6 +269,7 @@ See [RFC 911] for more details on the design of `const fn`s.

E0017: r##"
References in statics and constants may only refer to immutable values.
Erroneous code example:
```compile_fail,E0017
Expand All @@ -282,24 +292,17 @@ If you really want global mutable state, try using `static mut` or a global

E0019: r##"
A function call isn't allowed in the const's initialization expression
because the expression's value must be known at compile-time. Erroneous code
example:
because the expression's value must be known at compile-time.
```compile_fail
enum Test {
V1
}
Erroneous code example:
impl Test {
fn test(&self) -> i32 {
12
}
}
```compile_fail,E0019
#![feature(box_syntax)]
fn main() {
const FOO: Test = Test::V1;
struct MyOwned;
const A: i32 = FOO.test(); // You can't call Test::func() here!
static STATIC11: Box<MyOwned> = box MyOwned; // error!
}
```
Expand Down Expand Up @@ -328,13 +331,13 @@ fn main() {

E0030: r##"
When matching against a range, the compiler verifies that the range is
non-empty. Range patterns include both end-points, so this is equivalent to
non-empty. Range patterns include both end-points, so this is equivalent to
requiring the start of the range to be less than or equal to the end of the
range.
For example:
Erroneous code example:
```compile_fail
```compile_fail,E0030
match 5u32 {
// This range is ok, albeit pointless.
1 ..= 1 => {}
Expand Down Expand Up @@ -379,6 +382,26 @@ See also https://doc.rust-lang.org/book/ch19-01-unsafe-rust.html
"##,

E0158: r##"
An associated const has been referenced in a pattern.
Erroneous code example:
```compile_fail,E0158
enum EFoo { A, B, C, D }
trait Foo {
const X: EFoo;
}
fn test<A: Foo>(arg: EFoo) {
match arg {
A::X => { // error!
println!("A::X");
}
}
}
```
`const` and `static` mean different things. A `const` is a compile-time
constant, an alias for a literal value. This property means you can match it
directly within a pattern.
Expand All @@ -405,7 +428,7 @@ values of a known size can be moved.
Erroneous code example:
```compile_fail
```compile_fail,E0161
#![feature(box_syntax)]
fn main() {
Expand Down Expand Up @@ -705,7 +728,9 @@ about safety.
"##,

E0381: r##"
It is not allowed to use or capture an uninitialized variable. For example:
It is not allowed to use or capture an uninitialized variable.
Erroneous code example:
```compile_fail,E0381
fn main() {
Expand All @@ -727,7 +752,9 @@ fn main() {

E0382: r##"
This error occurs when an attempt is made to use a variable after its contents
have been moved elsewhere. For example:
have been moved elsewhere.
Erroneous code example:
```compile_fail,E0382
struct MyStruct { s: u32 }
Expand Down Expand Up @@ -934,7 +961,9 @@ E0387: r##"
#### Note: this error code is no longer emitted by the compiler.
This error occurs when an attempt is made to mutate or mutably reference data
that a closure has captured immutably. Examples of this error are shown below:
that a closure has captured immutably.
Erroneous code example:
```compile_fail
// Accepts a function or a closure that captures its environment immutably.
Expand Down Expand Up @@ -999,7 +1028,7 @@ An attempt was made to mutate data using a non-mutable reference. This
commonly occurs when attempting to assign to a non-mutable reference of a
mutable reference (`&(&mut T)`).
Example of erroneous code:
Erroneous code example:
```compile_fail
struct FancyNum {
Expand Down Expand Up @@ -1059,8 +1088,9 @@ fn main() {
"##,

E0492: r##"
A borrow of a constant containing interior mutability was attempted. Erroneous
code example:
A borrow of a constant containing interior mutability was attempted.
Erroneous code example:
```compile_fail,E0492
use std::sync::atomic::AtomicUsize;
Expand Down Expand Up @@ -1177,7 +1207,9 @@ static FOO: Foo = Foo { field1: DropType::A }; // We initialize all fields
"##,

E0499: r##"
A variable was borrowed as mutable more than once. Erroneous code example:
A variable was borrowed as mutable more than once.
Erroneous code example:
```compile_fail,E0499
let mut i = 0;
Expand Down Expand Up @@ -1208,7 +1240,9 @@ a;
"##,

E0500: r##"
A borrowed variable was used by a closure. Example of erroneous code:
A borrowed variable was used by a closure.
Erroneous code example:
```compile_fail,E0500
fn you_know_nothing(jon_snow: &mut i32) {
Expand Down Expand Up @@ -1259,7 +1293,7 @@ situation, the closure is borrowing the variable. Take a look at
http://rustbyexample.com/fn/closures/capture.html for more information about
capturing.
Example of erroneous code:
Erroneous code example:
```compile_fail,E0501
fn inside_closure(x: &mut i32) {
Expand Down Expand Up @@ -1332,7 +1366,7 @@ E0502: r##"
This error indicates that you are trying to borrow a variable as mutable when it
has already been borrowed as immutable.
Example of erroneous code:
Erroneous code example:
```compile_fail,E0502
fn bar(x: &mut i32) {}
Expand Down Expand Up @@ -1363,7 +1397,7 @@ https://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html.
E0503: r##"
A value was used after it was mutably borrowed.
Example of erroneous code:
Erroneous code example:
```compile_fail,E0503
fn main() {
Expand Down Expand Up @@ -1421,7 +1455,7 @@ E0504: r##"
This error occurs when an attempt is made to move a borrowed variable into a
closure.
Example of erroneous code:
Erroneous code example:
```compile_fail
struct FancyNum {
Expand Down Expand Up @@ -1612,7 +1646,7 @@ http://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html
E0506: r##"
This error occurs when an attempt is made to assign to a borrowed value.
Example of erroneous code:
Erroneous code example:
```compile_fail,E0506
struct FancyNum {
Expand Down Expand Up @@ -1830,7 +1864,7 @@ http://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html
E0508: r##"
A value was moved out of a non-copy fixed-size array.
Example of erroneous code:
Erroneous code example:
```compile_fail,E0508
struct NonCopy;
Expand Down Expand Up @@ -1875,7 +1909,7 @@ E0509: r##"
This error occurs when an attempt is made to move out of a value whose type
implements the `Drop` trait.
Example of erroneous code:
Erroneous code example:
```compile_fail,E0509
struct FancyNum {
Expand Down Expand Up @@ -1991,6 +2025,8 @@ Cannot return value that references local variable
Local variables, function parameters and temporaries are all dropped before the
end of the function body. So a reference to them cannot be returned.
Erroneous code example:
```compile_fail,E0515
fn get_dangling_reference() -> &'static i32 {
let x = 0;
Expand Down Expand Up @@ -2092,14 +2128,18 @@ is non-empty. Exclusive range patterns include the start point but not the end
point, so this is equivalent to requiring the start of the range to be less
than the end of the range.
For example:
Erroneous code example:
```compile_fail
match 5u32 {
// This range is ok, albeit pointless.
1 .. 2 => {}
// This range is empty, and the compiler can tell.
5 .. 5 => {}
```compile_fail,E0579
#![feature(exclusive_range_pattern)]
fn main() {
match 5u32 {
// This range is ok, albeit pointless.
1 .. 2 => {}
// This range is empty, and the compiler can tell.
5 .. 5 => {} // error!
}
}
```
"##,
Expand Down Expand Up @@ -2127,7 +2167,7 @@ let mut c = || { x += 1 };
E0596: r##"
This error occurs because you tried to mutably borrow a non-mutable variable.
Example of erroneous code:
Erroneous code example:
```compile_fail,E0596
let x = 1;
Expand All @@ -2146,7 +2186,7 @@ let y = &mut x; // ok!
E0597: r##"
This error occurs because a value was dropped while it was still borrowed
Example of erroneous code:
Erroneous code example:
```compile_fail,E0597
struct Foo<'a> {
Expand Down Expand Up @@ -2183,6 +2223,8 @@ E0626: r##"
This error occurs because a borrow in a generator persists across a
yield point.
Erroneous code example:
```compile_fail,E0626
# #![feature(generators, generator_trait, pin)]
# use std::ops::Generator;
Expand Down Expand Up @@ -2274,7 +2316,7 @@ E0712: r##"
This error occurs because a borrow of a thread-local variable was made inside a
function which outlived the lifetime of the function.
Example of erroneous code:
Erroneous code example:
```compile_fail,E0712
#![feature(thread_local)]
Expand All @@ -2296,7 +2338,7 @@ E0713: r##"
This error occurs when an attempt is made to borrow state past the end of the
lifetime of a type that implements the `Drop` trait.
Example of erroneous code:
Erroneous code example:
```compile_fail,E0713
#![feature(nll)]
Expand Down

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