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体验新版 GitCode,发现更多精彩内容 >>
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dac59ac9
编写于
12月 06, 2017
作者:
N
Niko Matsakis
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差异文件
escape-argument-callee: improve comment per arielb1's suggestions
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05977fe7
变更
2
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2 changed file
with
23 addition
and
18 deletion
+23
-18
src/test/ui/nll/closure-requirements/escape-argument-callee.rs
...est/ui/nll/closure-requirements/escape-argument-callee.rs
+10
-5
src/test/ui/nll/closure-requirements/escape-argument-callee.stderr
...ui/nll/closure-requirements/escape-argument-callee.stderr
+13
-13
未找到文件。
src/test/ui/nll/closure-requirements/escape-argument-callee.rs
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dac59ac9
...
...
@@ -10,12 +10,17 @@
// Test closure that:
//
// - takes an argument `y`
// - stores `y` into another, longer-lived spot
// - takes an argument `y`
with lifetime `'a` (in the code, it's anonymous)
// - stores `y` into another, longer-lived spot
with lifetime `'b`
//
// *but* the signature of the closure doesn't indicate that `y` lives
// long enough for that. The closure reports the error (and hence we
// see it before the closure's "external requirements" report).
// Because `'a` and `'b` are two different, unrelated higher-ranked
// regions with no relationship to one another, this is an error. This
// error is reported by the closure itself and is not propagated to
// its creator: this is because `'a` and `'b` are higher-ranked
// (late-bound) regions and the closure is not allowed to propagate
// additional where clauses between higher-ranked regions, only those
// that appear free in its type (hence, we see it before the closure's
// "external requirements" report).
// compile-flags:-Znll -Zborrowck=mir -Zverbose
...
...
src/test/ui/nll/closure-requirements/escape-argument-callee.stderr
浏览文件 @
dac59ac9
warning: not reporting region error due to -Znll
--> $DIR/escape-argument-callee.rs:3
1
:50
--> $DIR/escape-argument-callee.rs:3
6
:50
|
3
1
| let mut closure = expect_sig(|p, y| *p = y);
3
6
| let mut closure = expect_sig(|p, y| *p = y);
| ^
error: free region `'_#4r` does not outlive free region `'_#3r`
--> $DIR/escape-argument-callee.rs:3
1
:45
--> $DIR/escape-argument-callee.rs:3
6
:45
|
3
1
| let mut closure = expect_sig(|p, y| *p = y);
3
6
| let mut closure = expect_sig(|p, y| *p = y);
| ^^^^^^
note: External requirements
--> $DIR/escape-argument-callee.rs:3
1
:38
--> $DIR/escape-argument-callee.rs:3
6
:38
|
3
1
| let mut closure = expect_sig(|p, y| *p = y);
3
6
| let mut closure = expect_sig(|p, y| *p = y);
| ^^^^^^^^^^^^^
|
= note: defining type: DefId(0/1:9 ~ escape_argument_callee[317d]::test[0]::{{closure}}[0]) with closure substs [
...
...
@@ -23,15 +23,15 @@ note: External requirements
= note: number of external vids: 1
note: No external requirements
--> $DIR/escape-argument-callee.rs:
25
:1
--> $DIR/escape-argument-callee.rs:
30
:1
|
25
| / fn test() {
26
| | let x = 44;
27
| | let mut p = &x;
28
| |
30
| / fn test() {
31
| | let x = 44;
32
| | let mut p = &x;
33
| |
... |
37
| | deref(p);
38
| | }
42
| | deref(p);
43
| | }
| |_^
|
= note: defining type: DefId(0/0:3 ~ escape_argument_callee[317d]::test[0]) with substs []
...
...
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