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Add tests for generic code

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This commit is contained in:
HMPerson1 2017-10-21 13:42:35 -04:00
parent ff4a850353
commit bfa7a9b138
2 changed files with 54 additions and 18 deletions
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24
tests/ui/useless_asref.rs
View file

@ -1,5 +1,7 @@
#![deny(useless_asref)]
use std::fmt::Debug;
struct FakeAsRef;
#[allow(should_implement_trait)]
@ -54,6 +56,9 @@ fn not_ok() {
foo_rslice(mrrrrrslice);
}
foo_rrrrmr((&&&&MoreRef).as_ref());
generic_not_ok(mrslice);
generic_ok(mrslice);
}
fn ok() {
@ -87,7 +92,26 @@ fn ok() {
}
FakeAsRef.as_ref();
foo_rrrrmr(MoreRef.as_ref());
generic_not_ok(arr.as_mut());
generic_ok(&mut arr);
}
fn foo_mrt<T: Debug + ?Sized>(t: &mut T) { println!("{:?}", t); }
fn foo_rt<T: Debug + ?Sized>(t: &T) { println!("{:?}", t); }
fn generic_not_ok<T: AsMut<T> + AsRef<T> + Debug + ?Sized>(mrt: &mut T) {
foo_mrt(mrt.as_mut());
foo_mrt(mrt);
foo_rt(mrt.as_ref());
foo_rt(mrt);
}
fn generic_ok<U: AsMut<T> + AsRef<T> + ?Sized, T: Debug + ?Sized>(mru: &mut U) {
foo_mrt(mru.as_mut());
foo_rt(mru.as_ref());
}
fn main() {
not_ok();
ok();

48
tests/ui/useless_asref.stderr
View file

@ -1,7 +1,7 @@
error: this call to `as_ref` does nothing
--> $DIR/useless_asref.rs:29:18
--> $DIR/useless_asref.rs:31:18
|
29 | foo_rstr(rstr.as_ref());
31 | foo_rstr(rstr.as_ref());
| ^^^^^^^^^^^^^ help: try this: `rstr`
|
note: lint level defined here
@ -11,50 +11,62 @@ note: lint level defined here
| ^^^^^^^^^^^^^
error: this call to `as_ref` does nothing
--> $DIR/useless_asref.rs:31:20
--> $DIR/useless_asref.rs:33:20
|
31 | foo_rslice(rslice.as_ref());
33 | foo_rslice(rslice.as_ref());
| ^^^^^^^^^^^^^^^ help: try this: `rslice`
error: this call to `as_mut` does nothing
--> $DIR/useless_asref.rs:35:21
--> $DIR/useless_asref.rs:37:21
|
35 | foo_mrslice(mrslice.as_mut());
37 | foo_mrslice(mrslice.as_mut());
| ^^^^^^^^^^^^^^^^ help: try this: `mrslice`
error: this call to `as_ref` does nothing
--> $DIR/useless_asref.rs:37:20
--> $DIR/useless_asref.rs:39:20
|
37 | foo_rslice(mrslice.as_ref());
39 | foo_rslice(mrslice.as_ref());
| ^^^^^^^^^^^^^^^^ help: try this: `mrslice`
error: this call to `as_ref` does nothing
--> $DIR/useless_asref.rs:44:20
--> $DIR/useless_asref.rs:46:20
|
44 | foo_rslice(rrrrrslice.as_ref());
46 | foo_rslice(rrrrrslice.as_ref());
| ^^^^^^^^^^^^^^^^^^^ help: try this: `rrrrrslice`
error: this call to `as_ref` does nothing
--> $DIR/useless_asref.rs:46:18
--> $DIR/useless_asref.rs:48:18
|
46 | foo_rstr(rrrrrstr.as_ref());
48 | foo_rstr(rrrrrstr.as_ref());
| ^^^^^^^^^^^^^^^^^ help: try this: `rrrrrstr`
error: this call to `as_mut` does nothing
--> $DIR/useless_asref.rs:51:21
--> $DIR/useless_asref.rs:53:21
|
51 | foo_mrslice(mrrrrrslice.as_mut());
53 | foo_mrslice(mrrrrrslice.as_mut());
| ^^^^^^^^^^^^^^^^^^^^ help: try this: `mrrrrrslice`
error: this call to `as_ref` does nothing
--> $DIR/useless_asref.rs:53:20
--> $DIR/useless_asref.rs:55:20
|
53 | foo_rslice(mrrrrrslice.as_ref());
55 | foo_rslice(mrrrrrslice.as_ref());
| ^^^^^^^^^^^^^^^^^^^^ help: try this: `mrrrrrslice`
error: this call to `as_ref` does nothing
--> $DIR/useless_asref.rs:56:16
--> $DIR/useless_asref.rs:58:16
|
56 | foo_rrrrmr((&&&&MoreRef).as_ref());
58 | foo_rrrrmr((&&&&MoreRef).as_ref());
| ^^^^^^^^^^^^^^^^^^^^^^ help: try this: `(&&&&MoreRef)`
error: this call to `as_mut` does nothing
--> $DIR/useless_asref.rs:104:13
|
104 | foo_mrt(mrt.as_mut());
| ^^^^^^^^^^^^ help: try this: `mrt`
error: this call to `as_ref` does nothing
--> $DIR/useless_asref.rs:106:12
|
106 | foo_rt(mrt.as_ref());
| ^^^^^^^^^^^^ help: try this: `mrt`