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体验新版 GitCode,发现更多精彩内容 >>
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516a1772
编写于
5月 21, 2014
作者:
C
Cameron Zwarich
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电子邮件补丁
差异文件
Add a suggestion to use a `let` binding on some borrowck errors.
上级
f78eb143
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
38 addition
and
1 deletion
+38
-1
src/librustc/middle/borrowck/mod.rs
src/librustc/middle/borrowck/mod.rs
+18
-1
src/test/compile-fail/borrowck-let-suggestion.rs
src/test/compile-fail/borrowck-let-suggestion.rs
+20
-0
未找到文件。
src/librustc/middle/borrowck/mod.rs
浏览文件 @
516a1772
...
@@ -689,11 +689,16 @@ pub fn note_and_explain_bckerr(&self, err: BckError) {
...
@@ -689,11 +689,16 @@ pub fn note_and_explain_bckerr(&self, err: BckError) {
"reference must be valid for "
,
"reference must be valid for "
,
sub_scope
,
sub_scope
,
"..."
);
"..."
);
let
suggestion
=
if
is_statement_scope
(
self
.tcx
,
super_scope
)
{
"; consider using a `let` binding to increase its lifetime"
}
else
{
""
};
note_and_explain_region
(
note_and_explain_region
(
self
.tcx
,
self
.tcx
,
"...but borrowed value is only valid for "
,
"...but borrowed value is only valid for "
,
super_scope
,
super_scope
,
""
);
suggestion
);
}
}
err_borrowed_pointer_too_short
(
loan_scope
,
ptr_scope
,
_
)
=>
{
err_borrowed_pointer_too_short
(
loan_scope
,
ptr_scope
,
_
)
=>
{
...
@@ -779,6 +784,18 @@ pub fn cmt_to_str(&self, cmt: &mc::cmt_) -> StrBuf {
...
@@ -779,6 +784,18 @@ pub fn cmt_to_str(&self, cmt: &mc::cmt_) -> StrBuf {
}
}
}
}
fn
is_statement_scope
(
tcx
:
&
ty
::
ctxt
,
region
:
ty
::
Region
)
->
bool
{
match
region
{
ty
::
ReScope
(
node_id
)
=>
{
match
tcx
.map
.find
(
node_id
)
{
Some
(
ast_map
::
NodeStmt
(
_
))
=>
true
,
_
=>
false
}
}
_
=>
false
}
}
impl
DataFlowOperator
for
LoanDataFlowOperator
{
impl
DataFlowOperator
for
LoanDataFlowOperator
{
#[inline]
#[inline]
fn
initial_value
(
&
self
)
->
bool
{
fn
initial_value
(
&
self
)
->
bool
{
...
...
src/test/compile-fail/borrowck-let-suggestion.rs
0 → 100644
浏览文件 @
516a1772
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
fn
f
()
{
let
x
=
[
1
]
.iter
();
//~ ERROR borrowed value does not live long enough
//~^^ NOTE reference must be valid for the block
//~^^ NOTE consider using a `let` binding to increase its lifetime
}
fn
main
()
{
f
();
}
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