Commit Graph

27 Commits

Author SHA1 Message Date
Camille GILLOT
5cef88c1f4 Print the generic parameter along with the variance in dumps. 2024-08-23 23:00:45 +00:00
Michael Goulet
91acacf85b Peel off explicit (or implicit) deref before suggesting clone on move error in borrowck 2024-07-26 14:41:56 -04:00
Michael Goulet
e7eae5370e Remove logic to suggest clone of function output 2024-07-26 13:56:06 -04:00
Michael Goulet
c02d0de871 Account for structs that have unused params in nested types in fields 2024-07-17 21:12:12 -04:00
Michael Goulet
a0a251a688 Account for self ty alias 2024-07-17 16:48:17 -04:00
Michael Goulet
3716a3fd31 Mention that type parameters are used recursively 2024-07-17 15:57:38 -04:00
klensy
411607bec4 tests: remove some trailing ws 2024-04-27 10:54:31 +03:00
Esteban Küber
d68f2a6b71 Mention when type parameter could be Clone
```
error[E0382]: use of moved value: `t`
  --> $DIR/use_of_moved_value_copy_suggestions.rs:7:9
   |
LL | fn duplicate_t<T>(t: T) -> (T, T) {
   |                   - move occurs because `t` has type `T`, which does not implement the `Copy` trait
...
LL |     (t, t)
   |      -  ^ value used here after move
   |      |
   |      value moved here
   |
help: if `T` implemented `Clone`, you could clone the value
  --> $DIR/use_of_moved_value_copy_suggestions.rs:4:16
   |
LL | fn duplicate_t<T>(t: T) -> (T, T) {
   |                ^ consider constraining this type parameter with `Clone`
...
LL |     (t, t)
   |      - you could clone this value
help: consider restricting type parameter `T`
   |
LL | fn duplicate_t<T: Copy>(t: T) -> (T, T) {
   |                 ++++++
```

The `help` is new. On ADTs, we also extend the output with span labels:

```
error[E0507]: cannot move out of static item `FOO`
  --> $DIR/issue-17718-static-move.rs:6:14
   |
LL |     let _a = FOO;
   |              ^^^ move occurs because `FOO` has type `Foo`, which does not implement the `Copy` trait
   |
note: if `Foo` implemented `Clone`, you could clone the value
  --> $DIR/issue-17718-static-move.rs:1:1
   |
LL | struct Foo;
   | ^^^^^^^^^^ consider implementing `Clone` for this type
...
LL |     let _a = FOO;
   |              --- you could clone this value
help: consider borrowing here
   |
LL |     let _a = &FOO;
   |              +
```
2024-04-24 22:21:15 +00:00
Michael Goulet
b09c177743 Don't leak unnameable types in -> _ recover 2024-04-14 11:43:05 -04:00
Esteban Küber
d97d2fe744 Mention when the type of the moved value doesn't implement Clone 2024-04-11 16:41:42 +00:00
Esteban Küber
a1a3abb08f When possible, suggest cloning the result of a call instead of an argument
```
error[E0505]: cannot move out of `a` because it is borrowed
  --> $DIR/variance-issue-20533.rs:28:14
   |
LL |         let a = AffineU32(1);
   |             - binding `a` declared here
LL |         let x = foo(&a);
   |                     -- borrow of `a` occurs here
LL |         drop(a);
   |              ^ move out of `a` occurs here
LL |         drop(x);
   |              - borrow later used here
   |
help: consider cloning the value if the performance cost is acceptable
   |
LL |         let x = foo(&a).clone();
   |                        ++++++++
```
2024-04-11 16:41:41 +00:00
Esteban Küber
5a7caa3174 Fix accuracy of T: Clone check in suggestion 2024-04-11 16:41:41 +00:00
Esteban Küber
bce78102c3 Account for unops when suggesting cloning 2024-04-11 16:41:41 +00:00
Esteban Küber
fa2fc3ab96 Suggest .clone() when moved while borrowed 2024-04-11 16:41:41 +00:00
Esteban Küber
6b24fdf811 Provide structured suggestion for unconstrained generic constant
```
error: unconstrained generic constant
  --> $DIR/const-argument-if-length.rs:18:10
   |
LL |     pad: [u8; is_zst::<T>()],
   |          ^^^^^^^^^^^^^^^^^^^
   |
help: try adding a `where` bound
   |
LL | pub struct AtLeastByte<T: ?Sized> where [(); is_zst::<T>()]: {
   |                                   ++++++++++++++++++++++++++
```

Detect when the constant expression isn't `usize` and suggest casting:

```
error: unconstrained generic constant
 --> f300.rs:6:10
  |
6 |     bb::<{!N}>();
  |          ^^^^
-Ztrack-diagnostics: created at compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs:3539:36
  |
help: try adding a `where` bound
  |
5 | fn b<const N: bool>() where [(); {!N} as usize]: {
  |                       ++++++++++++++++++++++++++
```

Fix #122395.
2024-03-21 00:03:59 +00:00
Oli Scherer
96d24f2dd1 Revert "Auto merge of #122140 - oli-obk:track_errors13, r=davidtwco"
This reverts commit 65cd843ae0, reversing
changes made to d255c6a57c.
2024-03-11 21:28:16 +00:00
Oli Scherer
e2e751e76d Merge various rustc_attr based tests 2024-03-11 08:48:03 +00:00
Oli Scherer
8206cffc48 Merge check_mod_impl_wf and check_mod_type_wf 2024-03-07 06:27:09 +00:00
许杰友 Jieyou Xu (Joe)
ec2cc761bc
[AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
León Orell Valerian Liehr
02320b502d
Improve the diagnostics for unused generic parameters 2024-02-01 16:18:03 +01:00
Nilstrieb
41e8d152dc Show number in error message even for one error
Co-authored-by: Adrian <adrian.iosdev@gmail.com>
2023-11-24 19:15:52 +01:00
jyn
01b75e20f2 Move some UI tests into subdirectories
to avoid going over the existing limit now that the ui-fulldeps tests have
been moved to ui.
2023-04-02 19:42:30 -04:00
Ali MJ Al-Nasrawy
381187dc76 internally change regions to be covariant 2023-01-27 04:04:22 +03:00
Matthias Krüger
9e3f330656
Rollup merge of #106897 - estebank:issue-99430, r=davidtwco
Tweak E0597

CC #99430
2023-01-25 22:19:52 +01:00
Ezra Shaw
708861e5b7
remove error code from #[rustc_variance] and document its remains 2023-01-18 21:10:27 +13:00
Esteban Küber
656db98bd9 Tweak E0597
CC #99430
2023-01-15 19:46:20 +00:00
Albert Larsan
cf2dff2b1e
Move /src/test to /tests 2023-01-11 09:32:08 +00:00