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体验新版 GitCode,发现更多精彩内容 >>
提交
e87bf30f
编写于
9月 10, 2018
作者:
N
Niko Matsakis
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
propagate user-ascribes types down onto resulting bindings
But only in very simple cases.
上级
a8710539
变更
14
显示空白变更内容
内联
并排
Showing
14 changed file
with
171 addition
and
35 deletion
+171
-35
src/librustc/ich/impls_mir.rs
src/librustc/ich/impls_mir.rs
+1
-0
src/librustc/mir/mod.rs
src/librustc/mir/mod.rs
+9
-0
src/librustc/mir/visit.rs
src/librustc/mir/visit.rs
+4
-0
src/librustc_mir/borrow_check/nll/type_check/mod.rs
src/librustc_mir/borrow_check/nll/type_check/mod.rs
+19
-0
src/librustc_mir/build/block.rs
src/librustc_mir/build/block.rs
+1
-1
src/librustc_mir/build/expr/into.rs
src/librustc_mir/build/expr/into.rs
+1
-0
src/librustc_mir/build/matches/mod.rs
src/librustc_mir/build/matches/mod.rs
+42
-13
src/librustc_mir/build/mod.rs
src/librustc_mir/build/mod.rs
+1
-0
src/librustc_mir/lib.rs
src/librustc_mir/lib.rs
+1
-0
src/librustc_mir/shim.rs
src/librustc_mir/shim.rs
+3
-1
src/librustc_mir/transform/generator.rs
src/librustc_mir/transform/generator.rs
+3
-0
src/librustc_mir/util/pretty.rs
src/librustc_mir/util/pretty.rs
+7
-2
src/test/ui/nll/user-annotations/patterns.rs
src/test/ui/nll/user-annotations/patterns.rs
+34
-5
src/test/ui/nll/user-annotations/patterns.stderr
src/test/ui/nll/user-annotations/patterns.stderr
+45
-13
未找到文件。
src/librustc/ich/impls_mir.rs
浏览文件 @
e87bf30f
...
...
@@ -24,6 +24,7 @@
impl_stable_hash_for!
(
struct
mir
::
LocalDecl
<
'tcx
>
{
mutability
,
ty
,
user_ty
,
name
,
source_info
,
visibility_scope
,
...
...
src/librustc/mir/mod.rs
浏览文件 @
e87bf30f
...
...
@@ -640,6 +640,12 @@ pub struct LocalDecl<'tcx> {
/// Type of this local.
pub
ty
:
Ty
<
'tcx
>
,
/// If the user manually ascribed a type to this variable,
/// e.g. via `let x: T`, then we carry that type here. The MIR
/// borrow checker needs this information since it can affect
/// region inference.
pub
user_ty
:
Option
<
CanonicalTy
<
'tcx
>>
,
/// Name of the local, used in debuginfo and pretty-printing.
///
/// Note that function arguments can also have this set to `Some(_)`
...
...
@@ -802,6 +808,7 @@ fn new_local(
LocalDecl
{
mutability
,
ty
,
user_ty
:
None
,
name
:
None
,
source_info
:
SourceInfo
{
span
,
...
...
@@ -821,6 +828,7 @@ pub fn new_return_place(return_ty: Ty, span: Span) -> LocalDecl {
LocalDecl
{
mutability
:
Mutability
::
Mut
,
ty
:
return_ty
,
user_ty
:
None
,
source_info
:
SourceInfo
{
span
,
scope
:
OUTERMOST_SOURCE_SCOPE
,
...
...
@@ -2613,6 +2621,7 @@ impl<'tcx> TypeFoldable<'tcx> for LocalDecl<'tcx> {
is_user_variable
,
internal
,
ty
,
user_ty
,
name
,
source_info
,
visibility_scope
,
...
...
src/librustc/mir/visit.rs
浏览文件 @
e87bf30f
...
...
@@ -721,6 +721,7 @@ fn super_local_decl(&mut self,
let
LocalDecl
{
mutability
:
_
,
ref
$
(
$mutability
)
*
ty
,
ref
$
(
$mutability
)
*
user_ty
,
name
:
_
,
ref
$
(
$mutability
)
*
source_info
,
ref
$
(
$mutability
)
*
visibility_scope
,
...
...
@@ -732,6 +733,9 @@ fn super_local_decl(&mut self,
local
,
source_info
:
*
source_info
,
});
if
let
Some
(
user_ty
)
=
user_ty
{
self
.visit_canonical_ty
(
user_ty
);
}
self
.visit_source_info
(
source_info
);
self
.visit_source_scope
(
visibility_scope
);
}
...
...
src/librustc_mir/borrow_check/nll/type_check/mod.rs
浏览文件 @
e87bf30f
...
...
@@ -275,6 +275,25 @@ fn visit_rvalue(&mut self, rvalue: &Rvalue<'tcx>, location: Location) {
fn
visit_local_decl
(
&
mut
self
,
local
:
Local
,
local_decl
:
&
LocalDecl
<
'tcx
>
)
{
self
.super_local_decl
(
local
,
local_decl
);
self
.sanitize_type
(
local_decl
,
local_decl
.ty
);
if
let
Some
(
user_ty
)
=
local_decl
.user_ty
{
if
let
Err
(
terr
)
=
self
.cx
.relate_type_and_user_type
(
local_decl
.ty
,
ty
::
Variance
::
Invariant
,
user_ty
,
Locations
::
All
,
)
{
span_mirbug!
(
self
,
local
,
"bad user type on variable {:?}: {:?} != {:?} ({:?})"
,
local
,
local_decl
.ty
,
local_decl
.user_ty
,
terr
,
);
}
}
}
fn
visit_mir
(
&
mut
self
,
mir
:
&
Mir
<
'tcx
>
)
{
...
...
src/librustc_mir/build/block.rs
浏览文件 @
e87bf30f
...
...
@@ -143,7 +143,7 @@ fn ast_block_stmts(&mut self,
None
,
remainder_span
,
lint_level
,
slice
::
from_ref
(
&
pattern
),
ArmHasGuard
(
false
),
None
);
this
.visit_bindings
(
&
pattern
,
&
mut
|
this
,
_
,
_
,
_
,
node
,
span
,
_
|
{
this
.visit_bindings
(
&
pattern
,
None
,
&
mut
|
this
,
_
,
_
,
_
,
node
,
span
,
_
,
_
|
{
this
.storage_live_binding
(
block
,
node
,
span
,
OutsideGuard
);
this
.schedule_drop_for_binding
(
node
,
span
,
OutsideGuard
);
})
...
...
src/librustc_mir/build/expr/into.rs
浏览文件 @
e87bf30f
...
...
@@ -296,6 +296,7 @@ pub fn into_expr(
let
ptr_temp
=
this
.local_decls
.push
(
LocalDecl
{
mutability
:
Mutability
::
Mut
,
ty
:
ptr_ty
,
user_ty
:
None
,
name
:
None
,
source_info
,
visibility_scope
:
source_info
.scope
,
...
...
src/librustc_mir/build/matches/mod.rs
浏览文件 @
e87bf30f
...
...
@@ -399,7 +399,8 @@ pub fn declare_bindings(
let
num_patterns
=
patterns
.len
();
self
.visit_bindings
(
&
patterns
[
0
],
&
mut
|
this
,
mutability
,
name
,
mode
,
var
,
span
,
ty
|
{
None
,
&
mut
|
this
,
mutability
,
name
,
mode
,
var
,
span
,
ty
,
user_ty
|
{
if
visibility_scope
.is_none
()
{
visibility_scope
=
Some
(
this
.new_source_scope
(
scope_span
,
LintLevel
::
Inherited
,
None
));
...
...
@@ -421,6 +422,7 @@ pub fn declare_bindings(
num_patterns
,
var
,
ty
,
user_ty
,
has_guard
,
opt_match_place
.map
(|(
x
,
y
)|
(
x
.cloned
(),
y
)),
patterns
[
0
]
.span
,
...
...
@@ -470,10 +472,21 @@ pub fn schedule_drop_for_binding(&mut self, var: NodeId, span: Span, for_guard:
);
}
pub
fn
visit_bindings
<
F
>
(
&
mut
self
,
pattern
:
&
Pattern
<
'tcx
>
,
f
:
&
mut
F
)
where
F
:
FnMut
(
&
mut
Self
,
Mutability
,
Name
,
BindingMode
,
NodeId
,
Span
,
Ty
<
'tcx
>
),
{
pub
fn
visit_bindings
(
&
mut
self
,
pattern
:
&
Pattern
<
'tcx
>
,
pattern_user_ty
:
Option
<
CanonicalTy
<
'tcx
>>
,
f
:
&
mut
impl
FnMut
(
&
mut
Self
,
Mutability
,
Name
,
BindingMode
,
NodeId
,
Span
,
Ty
<
'tcx
>
,
Option
<
CanonicalTy
<
'tcx
>>
,
),
)
{
match
*
pattern
.kind
{
PatternKind
::
Binding
{
mutability
,
...
...
@@ -484,9 +497,9 @@ pub fn visit_bindings<F>(&mut self, pattern: &Pattern<'tcx>, f: &mut F)
ref
subpattern
,
..
}
=>
{
f
(
self
,
mutability
,
name
,
mode
,
var
,
pattern
.span
,
ty
);
f
(
self
,
mutability
,
name
,
mode
,
var
,
pattern
.span
,
ty
,
pattern_user_ty
);
if
let
Some
(
subpattern
)
=
subpattern
.as_ref
()
{
self
.visit_bindings
(
subpattern
,
f
);
self
.visit_bindings
(
subpattern
,
pattern_user_ty
,
f
);
}
}
PatternKind
::
Array
{
...
...
@@ -499,21 +512,34 @@ pub fn visit_bindings<F>(&mut self, pattern: &Pattern<'tcx>, f: &mut F)
ref
slice
,
ref
suffix
,
}
=>
{
// FIXME(#47184): extract or handle `pattern_user_ty` somehow
for
subpattern
in
prefix
.iter
()
.chain
(
slice
)
.chain
(
suffix
)
{
self
.visit_bindings
(
subpattern
,
f
);
self
.visit_bindings
(
subpattern
,
None
,
f
);
}
}
PatternKind
::
Constant
{
..
}
|
PatternKind
::
Range
{
..
}
|
PatternKind
::
Wild
=>
{}
PatternKind
::
AscribeUserType
{
ref
subpattern
,
..
}
|
PatternKind
::
Deref
{
ref
subpattern
}
=>
{
self
.visit_bindings
(
subpattern
,
f
);
PatternKind
::
Deref
{
ref
subpattern
}
=>
{
// FIXME(#47184): extract or handle `pattern_user_ty` somehow
self
.visit_bindings
(
subpattern
,
None
,
f
);
}
PatternKind
::
AscribeUserType
{
ref
subpattern
,
user_ty
}
=>
{
// This corresponds to something like
//
// ```
// let (p1: T1): T2 = ...;
// ```
//
// Not presently possible, though maybe someday.
assert
!
(
pattern_user_ty
.is_none
());
self
.visit_bindings
(
subpattern
,
Some
(
user_ty
),
f
)
}
PatternKind
::
Leaf
{
ref
subpatterns
}
|
PatternKind
::
Variant
{
ref
subpatterns
,
..
}
=>
{
// FIXME(#47184): extract or handle `pattern_user_ty` somehow
for
subpattern
in
subpatterns
{
self
.visit_bindings
(
&
subpattern
.pattern
,
f
);
self
.visit_bindings
(
&
subpattern
.pattern
,
None
,
f
);
}
}
}
...
...
@@ -1375,6 +1401,7 @@ fn declare_binding(
num_patterns
:
usize
,
var_id
:
NodeId
,
var_ty
:
Ty
<
'tcx
>
,
user_var_ty
:
Option
<
CanonicalTy
<
'tcx
>>
,
has_guard
:
ArmHasGuard
,
opt_match_place
:
Option
<
(
Option
<
Place
<
'tcx
>>
,
Span
)
>
,
pat_span
:
Span
,
...
...
@@ -1392,7 +1419,8 @@ fn declare_binding(
};
let
local
=
LocalDecl
::
<
'tcx
>
{
mutability
,
ty
:
var_ty
.clone
(),
ty
:
var_ty
,
user_ty
:
user_var_ty
,
name
:
Some
(
name
),
source_info
,
visibility_scope
,
...
...
@@ -1424,6 +1452,7 @@ fn declare_binding(
// See previous comment.
mutability
:
Mutability
::
Not
,
ty
:
tcx
.mk_imm_ref
(
tcx
.types.re_empty
,
var_ty
),
user_ty
:
None
,
name
:
Some
(
name
),
source_info
,
visibility_scope
,
...
...
src/librustc_mir/build/mod.rs
浏览文件 @
e87bf30f
...
...
@@ -730,6 +730,7 @@ fn args_and_body(&mut self,
self
.local_decls
.push
(
LocalDecl
{
mutability
:
Mutability
::
Mut
,
ty
,
user_ty
:
None
,
source_info
,
visibility_scope
:
source_info
.scope
,
name
,
...
...
src/librustc_mir/lib.rs
浏览文件 @
e87bf30f
...
...
@@ -39,6 +39,7 @@
#![feature(if_while_or_patterns)]
#![feature(try_from)]
#![feature(reverse_bits)]
#![feature(underscore_imports)]
#![recursion_limit=
"256"
]
...
...
src/librustc_mir/shim.rs
浏览文件 @
e87bf30f
...
...
@@ -140,7 +140,9 @@ enum CallKind {
fn
temp_decl
(
mutability
:
Mutability
,
ty
:
Ty
,
span
:
Span
)
->
LocalDecl
{
let
source_info
=
SourceInfo
{
scope
:
OUTERMOST_SOURCE_SCOPE
,
span
};
LocalDecl
{
mutability
,
ty
,
name
:
None
,
mutability
,
ty
,
user_ty
:
None
,
name
:
None
,
source_info
,
visibility_scope
:
source_info
.scope
,
internal
:
false
,
...
...
src/librustc_mir/transform/generator.rs
浏览文件 @
e87bf30f
...
...
@@ -303,6 +303,7 @@ fn replace_result_variable<'tcx>(
let
new_ret
=
LocalDecl
{
mutability
:
Mutability
::
Mut
,
ty
:
ret_ty
,
user_ty
:
None
,
name
:
None
,
source_info
,
visibility_scope
:
source_info
.scope
,
...
...
@@ -656,6 +657,7 @@ fn create_generator_drop_shim<'a, 'tcx>(
mir
.local_decls
[
RETURN_PLACE
]
=
LocalDecl
{
mutability
:
Mutability
::
Mut
,
ty
:
tcx
.mk_nil
(),
user_ty
:
None
,
name
:
None
,
source_info
,
visibility_scope
:
source_info
.scope
,
...
...
@@ -672,6 +674,7 @@ fn create_generator_drop_shim<'a, 'tcx>(
ty
:
gen_ty
,
mutbl
:
hir
::
Mutability
::
MutMutable
,
}),
user_ty
:
None
,
name
:
None
,
source_info
,
visibility_scope
:
source_info
.scope
,
...
...
src/librustc_mir/util/pretty.rs
浏览文件 @
e87bf30f
...
...
@@ -17,6 +17,7 @@
use
rustc_data_structures
::
fx
::
FxHashMap
;
use
rustc_data_structures
::
indexed_vec
::
Idx
;
use
std
::
fmt
::
Display
;
use
std
::
fmt
::
Write
as
_
;
use
std
::
fs
;
use
std
::
io
::{
self
,
Write
};
use
std
::
path
::{
Path
,
PathBuf
};
...
...
@@ -493,14 +494,18 @@ fn write_scope_tree(
};
let
indent
=
indent
+
INDENT
.len
();
let
indented_var
=
format!
(
"{0:1$}let {2}{3:?}: {4:?}
;
"
,
let
mut
indented_var
=
format!
(
"{0:1$}let {2}{3:?}: {4:?}"
,
INDENT
,
indent
,
mut_str
,
local
,
var
.ty
);
if
let
Some
(
user_ty
)
=
var
.user_ty
{
write!
(
indented_var
,
" as {:?}"
,
user_ty
)
.unwrap
();
}
indented_var
.push_str
(
";"
);
writeln!
(
w
,
"{0:1$} //
\"
{2}
\"
in {3}"
,
...
...
src/test/ui/nll/user-annotations/patterns.rs
浏览文件 @
e87bf30f
...
...
@@ -3,10 +3,41 @@
#![feature(nll)]
fn
variable_no_initializer
()
{
// FIXME: It is unclear to me whether this should be an error or not.
let
x
=
22
;
let
y
:
&
'static
u32
;
y
=
&
x
;
//~ ERROR
}
fn
tuple_no_initializer
()
{
// FIXME(#47187): We are not propagating ascribed type through tuples.
let
x
=
22
;
let
(
y
,
z
):
(
&
'static
u32
,
&
'static
u32
);
y
=
&
x
;
}
fn
ref_with_ascribed_static_type
()
->
u32
{
// Check the behavior in some wacky cases.
let
x
=
22
;
let
y
=
&
x
;
//~ ERROR
let
ref
z
:
&
'static
u32
=
y
;
//~ ERROR
**
z
}
fn
ref_with_ascribed_any_type
()
->
u32
{
let
x
=
22
;
let
y
=
&
x
;
let
ref
z
:
&
u32
=
y
;
**
z
}
struct
Single
<
T
>
{
value
:
T
}
fn
struct_no_initializer
()
{
// FIXME(#47187): We are not propagating ascribed type through patterns.
let
x
=
22
;
let
Single
{
value
:
y
}:
Single
<&
'static
u32
>
;
y
=
&
x
;
}
...
...
@@ -39,8 +70,6 @@ fn pair_variable_with_initializer() {
let
(
y
,
_
):
(
&
'static
u32
,
u32
)
=
(
&
x
,
44
);
//~ ERROR
}
struct
Single
<
T
>
{
value
:
T
}
fn
struct_single_field_variable_with_initializer
()
{
let
x
=
22
;
let
Single
{
value
:
y
}:
Single
<&
'static
u32
>
=
Single
{
value
:
&
x
};
//~ ERROR
...
...
@@ -73,7 +102,7 @@ fn static_to_a_to_static_through_variable<'a>(x: &'a u32) -> &'static u32 {
}
fn
static_to_a_to_static_through_tuple
<
'a
>
(
x
:
&
'a
u32
)
->
&
'static
u32
{
// FIXME: The fact that this type-checks is perhaps surprising.
// FIXME
(#47187)
: The fact that this type-checks is perhaps surprising.
// What happens is that the right-hand side is constrained to have
// type `&'a u32`, which is possible, because it has type
// `&'static u32`. The variable `y` is then forced to have type
...
...
src/test/ui/nll/user-annotations/patterns.stderr
浏览文件 @
e87bf30f
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:15:27
--> $DIR/patterns.rs:8:9
|
LL | y = &x; //~ ERROR
| ^^ borrowed value does not live long enough
LL | }
| - `x` dropped here while still borrowed
|
= note: borrowed value must be valid for the static lifetime...
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:22:13
|
LL | let y = &x; //~ ERROR
| ^^ borrowed value does not live long enough
...
LL | }
| - `x` dropped here while still borrowed
|
= note: borrowed value must be valid for the static lifetime...
error[E0597]: `y` does not live long enough
--> $DIR/patterns.rs:23:9
|
LL | let ref z: &'static u32 = y; //~ ERROR
| ^^^^^ borrowed value does not live long enough
LL | **z
LL | }
| - `y` dropped here while still borrowed
|
= note: borrowed value must be valid for the static lifetime...
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:46:27
|
LL | let y: &'static u32 = &x; //~ ERROR
| ^^ borrowed value does not live long enough
...
...
@@ -9,7 +41,7 @@ LL | }
= note: borrowed value must be valid for the static lifetime...
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:
20
:27
--> $DIR/patterns.rs:
51
:27
|
LL | let _: &'static u32 = &x; //~ ERROR
| ^^ borrowed value does not live long enough
...
...
@@ -20,7 +52,7 @@ LL | }
= note: borrowed value must be valid for the static lifetime...
error[E0597]: borrowed value does not live long enough
--> $DIR/patterns.rs:
22
:41
--> $DIR/patterns.rs:
53
:41
|
LL | let _: Vec<&'static String> = vec![&String::new()];
| ^^^^^^^^^^^^^ - temporary value only lives until here
...
...
@@ -30,7 +62,7 @@ LL | let _: Vec<&'static String> = vec![&String::new()];
= note: borrowed value must be valid for the static lifetime...
error[E0597]: borrowed value does not live long enough
--> $DIR/patterns.rs:
25
:52
--> $DIR/patterns.rs:
56
:52
|
LL | let (_, a): (Vec<&'static String>, _) = (vec![&String::new()], 44);
| ^^^^^^^^^^^^^ - temporary value only lives until here
...
...
@@ -40,7 +72,7 @@ LL | let (_, a): (Vec<&'static String>, _) = (vec![&String::new()], 44);
= note: borrowed value must be valid for the static lifetime...
error[E0597]: borrowed value does not live long enough
--> $DIR/patterns.rs:
28
:53
--> $DIR/patterns.rs:
59
:53
|
LL | let (_a, b): (Vec<&'static String>, _) = (vec![&String::new()], 44);
| ^^^^^^^^^^^^^ - temporary value only lives until here
...
...
@@ -50,7 +82,7 @@ LL | let (_a, b): (Vec<&'static String>, _) = (vec![&String::new()], 44);
= note: borrowed value must be valid for the static lifetime...
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:
34
:40
--> $DIR/patterns.rs:
65
:40
|
LL | let (_, _): (&'static u32, u32) = (&x, 44); //~ ERROR
| ^^ borrowed value does not live long enough
...
...
@@ -60,7 +92,7 @@ LL | }
= note: borrowed value must be valid for the static lifetime...
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:
39
:40
--> $DIR/patterns.rs:
70
:40
|
LL | let (y, _): (&'static u32, u32) = (&x, 44); //~ ERROR
| ^^ borrowed value does not live long enough
...
...
@@ -70,7 +102,7 @@ LL | }
= note: borrowed value must be valid for the static lifetime...
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:
46
:69
--> $DIR/patterns.rs:
75
:69
|
LL | let Single { value: y }: Single<&'static u32> = Single { value: &x }; //~ ERROR
| ^^ borrowed value does not live long enough
...
...
@@ -80,7 +112,7 @@ LL | }
= note: borrowed value must be valid for the static lifetime...
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:
51
:69
--> $DIR/patterns.rs:
80
:69
|
LL | let Single { value: _ }: Single<&'static u32> = Single { value: &x }; //~ ERROR
| ^^ borrowed value does not live long enough
...
...
@@ -90,7 +122,7 @@ LL | }
= note: borrowed value must be valid for the static lifetime...
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:
59
:17
--> $DIR/patterns.rs:
88
:17
|
LL | value1: &x, //~ ERROR
| ^^ borrowed value does not live long enough
...
...
@@ -101,7 +133,7 @@ LL | }
= note: borrowed value must be valid for the static lifetime...
error: unsatisfied lifetime constraints
--> $DIR/patterns.rs:
72
:5
--> $DIR/patterns.rs:
101
:5
|
LL | fn static_to_a_to_static_through_variable<'a>(x: &'a u32) -> &'static u32 {
| -- lifetime `'a` defined here
...
...
@@ -110,13 +142,13 @@ LL | y //~ ERROR
| ^ returning this value requires that `'a` must outlive `'static`
error: unsatisfied lifetime constraints
--> $DIR/patterns.rs:
88
:40
--> $DIR/patterns.rs:
117
:40
|
LL | fn a_to_static_then_static<'a>(x: &'a u32) -> &'static u32 {
| -- lifetime `'a` defined here
LL | let (y, _z): (&'static u32, u32) = (x, 44); //~ ERROR
| ^^^^^^^ requires that `'a` must outlive `'static`
error: aborting due to 1
2
previous errors
error: aborting due to 1
5
previous errors
For more information about this error, try `rustc --explain E0597`.
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