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Add notes for test examples.

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uHOOCCOOHu 2018-06-19 23:12:17 +08:00
parent ce1800d599
commit 5b57b5fc61
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2 changed files with 28 additions and 16 deletions
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16
tests/ui/lifetimes.rs
View file

@ -53,9 +53,21 @@ fn fn_bound_2<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I>
where for<'x> F: Fn(Lt<'x, I>) -> Lt<'x, I>
{ unreachable!() }
fn fn_bound_3<'a, F: FnOnce(&'a ())>(x: &'a (), f: F) {} // no error, referenced
fn fn_bound_3<'a, F: FnOnce(&'a i32)>(x: &'a i32, f: F) { // no error, see below
f(x);
}
fn fn_bound_4<'a, F: FnOnce() -> &'a ()>(x: &'a (), f: F) {} // no error, referenced
fn fn_bound_3_cannot_elide() {
let x = 42;
let p = &x;
let mut q = &x;
fn_bound_3(p, |y| q = y); // this will fail if we elides lifetimes of `fn_bound_3`
}
// no error, multiple input refs
fn fn_bound_4<'a, F: FnOnce() -> &'a ()>(cond: bool, x: &'a (), f: F) -> &'a () {
if cond { x } else { f() }
}
struct X {
x: u8,

28
tests/ui/lifetimes.stderr
View file

@ -45,45 +45,45 @@ error: explicit lifetimes given in parameter types where they could be elided
| |__________________^
error: explicit lifetimes given in parameter types where they could be elided
--> $DIR/lifetimes.rs:65:5
--> $DIR/lifetimes.rs:77:5
|
65 | fn self_and_out<'s>(&'s self) -> &'s u8 { &self.x }
77 | fn self_and_out<'s>(&'s self) -> &'s u8 { &self.x }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided
--> $DIR/lifetimes.rs:69:5
--> $DIR/lifetimes.rs:81:5
|
69 | fn distinct_self_and_in<'s, 't>(&'s self, _x: &'t u8) { }
81 | fn distinct_self_and_in<'s, 't>(&'s self, _x: &'t u8) { }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided
--> $DIR/lifetimes.rs:85:1
--> $DIR/lifetimes.rs:97:1
|
85 | fn struct_with_lt<'a>(_foo: Foo<'a>) -> &'a str { unimplemented!() }
97 | fn struct_with_lt<'a>(_foo: Foo<'a>) -> &'a str { unimplemented!() }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided
--> $DIR/lifetimes.rs:105:1
--> $DIR/lifetimes.rs:117:1
|
105 | fn trait_obj_elided2<'a>(_arg: &'a Drop) -> &'a str { unimplemented!() }
117 | fn trait_obj_elided2<'a>(_arg: &'a Drop) -> &'a str { unimplemented!() }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided
--> $DIR/lifetimes.rs:109:1
--> $DIR/lifetimes.rs:121:1
|
109 | fn alias_with_lt<'a>(_foo: FooAlias<'a>) -> &'a str { unimplemented!() }
121 | fn alias_with_lt<'a>(_foo: FooAlias<'a>) -> &'a str { unimplemented!() }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided
--> $DIR/lifetimes.rs:120:1
--> $DIR/lifetimes.rs:132:1
|
120 | fn named_input_elided_output<'a>(_arg: &'a str) -> &str { unimplemented!() }
132 | fn named_input_elided_output<'a>(_arg: &'a str) -> &str { unimplemented!() }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided
--> $DIR/lifetimes.rs:124:1
--> $DIR/lifetimes.rs:136:1
|
124 | fn trait_bound_ok<'a, T: WithLifetime<'static>>(_: &'a u8, _: T) { unimplemented!() }
136 | fn trait_bound_ok<'a, T: WithLifetime<'static>>(_: &'a u8, _: T) { unimplemented!() }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 14 previous errors