add long explanation for E0453, lint attribute overruled by outer forbid

This is a subtask of #32777.
This commit is contained in:
Zack M. Davis 2016-06-12 12:57:05 -07:00
parent a76698b5ee
commit c17f1a66f9

View File

@ -1444,6 +1444,51 @@ lint name). Ensure the attribute is of this form:
```
"##,
E0453: r##"
A lint check attribute was overruled by a `forbid` directive set as an
attribute on an enclosing scope, or on the command line with the `-F` option.
Example of erroneous code:
```compile_fail
#![forbid(non_snake_case)]
#[allow(non_snake_case)]
fn main() {
let MyNumber = 2; // error: allow(non_snake_case) overruled by outer
// forbid(non_snake_case)
}
```
The `forbid` lint setting makes code that fails the lint check result in a
compilation-terminating error (like `deny`), but also prevents itself from
being overridden by inner attributes.
You can change `forbid` to `deny` (or use `-D` instead of `-F` if the `forbid`
setting was given as a command-line option) to allow the inner lint check
attribute:
```
#![deny(non_snake_case)]
#[allow(non_snake_case)]
fn main() {
let MyNumber = 2; // ok!
}
```
Alternatively, edit the code to pass the lint check, and remove the overruled
attribute:
```
#![forbid(non_snake_case)]
fn main() {
let my_number = 2;
}
```
"##,
E0496: r##"
A lifetime name is shadowing another lifetime name. Erroneous code example:
@ -1628,7 +1673,6 @@ register_diagnostics! {
E0314, // closure outlives stack frame
E0315, // cannot invoke closure outside of its lifetime
E0316, // nested quantification of lifetimes
E0453, // overruled by outer forbid
E0473, // dereference of reference outside its lifetime
E0474, // captured variable `..` does not outlive the enclosing closure
E0475, // index of slice outside its lifetime