user0/rust
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Improve mutability error suggestions.

Browse source 
This commit improves mutability error suggestions by suggesting the
removal of `&mut` where a mutable borrow is being taken of a `&mut self`
or a `self: &mut Self`.
This commit is contained in:
David Wood 2018-10-01 19:20:57 +02:00
parent 43b5d725d0
commit 2be306939d
No known key found for this signature in database
GPG key ID: 01760B4F9F53F154
4 changed files with 74 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

12
src/test/ui/did_you_mean/issue-31424.nll.stderr
View file

@ -2,15 +2,19 @@ error[E0596]: cannot borrow `self` as mutable, as it is not declared as mutable
--> $DIR/issue-31424.rs:17:9
|
LL | (&mut self).bar(); //~ ERROR cannot borrow
| ^^^^^^^^^^^ cannot borrow as mutable
| ^^^^^^^^^^^
| |
| cannot borrow as mutable
| try removing `&mut` here
error[E0596]: cannot borrow `self` as mutable, as it is not declared as mutable
--> $DIR/issue-31424.rs:23:9
|
LL | fn bar(self: &mut Self) {
| ---- help: consider changing this to be mutable: `mut self`
LL | (&mut self).bar(); //~ ERROR cannot borrow
| ^^^^^^^^^^^ cannot borrow as mutable
| ^^^^^^^^^^^
| |
| cannot borrow as mutable
| try removing `&mut` here
error: aborting due to 2 previous errors

11
src/test/ui/nll/issue-51191.rs
View file

@ -14,11 +14,13 @@ struct Struct;
impl Struct {
fn bar(self: &mut Self) {
(&mut self).bar(); //~ ERROR cannot borrow
(&mut self).bar();
//~^ ERROR cannot borrow `self` as mutable, as it is not declared as mutable [E0596]
}
fn imm(self) {
(&mut self).bar(); //~ ERROR cannot borrow
(&mut self).bar();
//~^ ERROR cannot borrow `self` as mutable, as it is not declared as mutable [E0596]
}
fn mtbl(mut self) {
@ -26,11 +28,14 @@ impl Struct {
}
fn immref(&self) {
(&mut self).bar(); //~ ERROR cannot borrow
(&mut self).bar();
//~^ ERROR cannot borrow `self` as mutable, as it is not declared as mutable [E0596]
//~^^ ERROR cannot borrow data in a `&` reference as mutable [E0596]
}
fn mtblref(&mut self) {
(&mut self).bar();
//~^ ERROR cannot borrow `self` as mutable, as it is not declared as mutable [E0596]
}
}

42
src/test/ui/nll/issue-51191.stderr
View file

@ -1,37 +1,41 @@
error[E0596]: cannot borrow `self` as mutable, as it is not declared as mutable
--> $DIR/issue-51191.rs:17:9
|
LL | fn bar(self: &mut Self) {
| ---- help: consider changing this to be mutable: `mut self`
LL | (&mut self).bar(); //~ ERROR cannot borrow
| ^^^^^^^^^^^ cannot borrow as mutable
LL | (&mut self).bar();
| ^^^^^^^^^^^
| |
| cannot borrow as mutable
| try removing `&mut` here
error[E0596]: cannot borrow `self` as mutable, as it is not declared as mutable
--> $DIR/issue-51191.rs:21:9
--> $DIR/issue-51191.rs:22:9
|
LL | fn imm(self) {
| ---- help: consider changing this to be mutable: `mut self`
LL | (&mut self).bar(); //~ ERROR cannot borrow
LL | (&mut self).bar();
| ^^^^^^^^^^^ cannot borrow as mutable
error[E0596]: cannot borrow `self` as mutable, as it is not declared as mutable
--> $DIR/issue-51191.rs:29:9
|
LL | (&mut self).bar(); //~ ERROR cannot borrow
| ^^^^^^^^^^^ cannot borrow as mutable
error[E0596]: cannot borrow data in a `&` reference as mutable
--> $DIR/issue-51191.rs:29:9
|
LL | (&mut self).bar(); //~ ERROR cannot borrow
| ^^^^^^^^^^^ cannot borrow as mutable
error[E0596]: cannot borrow `self` as mutable, as it is not declared as mutable
--> $DIR/issue-51191.rs:33:9
--> $DIR/issue-51191.rs:31:9
|
LL | (&mut self).bar();
| ^^^^^^^^^^^ cannot borrow as mutable
error[E0596]: cannot borrow data in a `&` reference as mutable
--> $DIR/issue-51191.rs:31:9
|
LL | (&mut self).bar();
| ^^^^^^^^^^^ cannot borrow as mutable
error[E0596]: cannot borrow `self` as mutable, as it is not declared as mutable
--> $DIR/issue-51191.rs:37:9
|
LL | (&mut self).bar();
| ^^^^^^^^^^^
| |
| cannot borrow as mutable
| try removing `&mut` here
error: aborting due to 5 previous errors
For more information about this error, try `rustc --explain E0596`.