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体验新版 GitCode,发现更多精彩内容 >>
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003f19a2
编写于
12月 18, 2016
作者:
J
Julien Couvreur
提交者:
GitHub
12月 18, 2016
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差异文件
Underscore should report an error if used as discard with langver < 7 (#15962)
上级
f97d2ab9
变更
2
显示空白变更内容
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并排
Showing
2 changed file
with
107 addition
and
1 deletion
+107
-1
src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs
src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs
+7
-1
src/Compilers/CSharp/Test/Emit/CodeGen/CodeGenDeconstructTests.cs
...ilers/CSharp/Test/Emit/CodeGen/CodeGenDeconstructTests.cs
+100
-0
未找到文件。
src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs
浏览文件 @
003f19a2
...
...
@@ -1240,7 +1240,13 @@ private static bool FallBackOnDiscard(IdentifierNameSyntax node, DiagnosticBag d
}
CSharpSyntaxNode
containingDeconstruction
=
node
.
GetContainingDeconstruction
();
return
containingDeconstruction
!=
null
||
IsOutVarDiscardIdentifier
(
node
);
bool
isDiscard
=
containingDeconstruction
!=
null
||
IsOutVarDiscardIdentifier
(
node
);
if
(
isDiscard
)
{
CheckFeatureAvailability
(
node
.
Location
,
MessageID
.
IDS_FeatureTuples
,
diagnostics
);
}
return
isDiscard
;
}
private
static
bool
IsOutVarDiscardIdentifier
(
SimpleNameSyntax
node
)
...
...
src/Compilers/CSharp/Test/Emit/CodeGen/CodeGenDeconstructTests.cs
浏览文件 @
003f19a2
...
...
@@ -5125,6 +5125,106 @@ static void Main()
Assert
.
Equal
(
"System.Int32"
,
model
.
GetTypeInfo
(
discard1
).
Type
.
ToTestDisplayString
());
}
[
Fact
]
public
void
SingleDiscardInAssignmentInCSharp6
()
{
var
source
=
@"
class C
{
static void Error()
{
_ = 1;
}
static void Ok()
{
int _;
_ = 1;
System.Console.Write(_);
}
}
"
;
var
comp
=
CreateCompilationWithMscorlib
(
source
,
parseOptions
:
TestOptions
.
Regular6
);
comp
.
VerifyDiagnostics
(
// (6,9): error CS8059: Feature 'tuples' is not available in C# 6. Please use language version 7 or greater.
// _ = M();
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"_"
).
WithArguments
(
"tuples"
,
"7"
).
WithLocation
(
6
,
9
)
);
}
[
Fact
]
public
void
VariousDiscardsInCSharp6
()
{
var
source
=
@"
class C
{
static void M(out int x)
{
(_, var _, int _) = (1, 2, 3);
var (_, _) = (1, 2);
bool b = 3 is int _;
switch (3)
{
case _: // not a discard
break;
}
switch (3)
{
case int _:
break;
}
M(out var _);
M(out int _);
M(out _);
x = 2;
}
}
"
;
var
comp
=
CreateCompilationWithMscorlib
(
source
,
parseOptions
:
TestOptions
.
Regular6
,
references
:
s_valueTupleRefs
);
comp
.
VerifyDiagnostics
(
// (6,9): error CS8059: Feature 'tuples' is not available in C# 6. Please use language version 7 or greater.
// (_, var _, int _) = (1, 2, 3);
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"(_, var _, int _)"
).
WithArguments
(
"tuples"
,
"7"
).
WithLocation
(
6
,
9
),
// (6,29): error CS8059: Feature 'tuples' is not available in C# 6. Please use language version 7 or greater.
// (_, var _, int _) = (1, 2, 3);
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"(1, 2, 3)"
).
WithArguments
(
"tuples"
,
"7"
).
WithLocation
(
6
,
29
),
// (7,13): error CS8059: Feature 'tuples' is not available in C# 6. Please use language version 7 or greater.
// var (_, _) = (1, 2);
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"(_, _)"
).
WithArguments
(
"tuples"
,
"7"
).
WithLocation
(
7
,
13
),
// (7,22): error CS8059: Feature 'tuples' is not available in C# 6. Please use language version 7 or greater.
// var (_, _) = (1, 2);
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"(1, 2)"
).
WithArguments
(
"tuples"
,
"7"
).
WithLocation
(
7
,
22
),
// (8,18): error CS8059: Feature 'pattern matching' is not available in C# 6. Please use language version 7 or greater.
// bool b = 3 is int _;
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"3 is int _"
).
WithArguments
(
"pattern matching"
,
"7"
).
WithLocation
(
8
,
18
),
// (16,13): error CS8059: Feature 'pattern matching' is not available in C# 6. Please use language version 7 or greater.
// case int _:
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"case int _:"
).
WithArguments
(
"pattern matching"
,
"7"
).
WithLocation
(
16
,
13
),
// (19,19): error CS8059: Feature 'out variable declaration' is not available in C# 6. Please use language version 7 or greater.
// M(out var _);
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"_"
).
WithArguments
(
"out variable declaration"
,
"7"
).
WithLocation
(
19
,
19
),
// (20,19): error CS8059: Feature 'out variable declaration' is not available in C# 6. Please use language version 7 or greater.
// M(out int _);
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"_"
).
WithArguments
(
"out variable declaration"
,
"7"
).
WithLocation
(
20
,
19
),
// (6,10): error CS8059: Feature 'tuples' is not available in C# 6. Please use language version 7 or greater.
// (_, var _, int _) = (1, 2, 3);
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"_"
).
WithArguments
(
"tuples"
,
"7"
).
WithLocation
(
6
,
10
),
// (11,18): error CS0103: The name '_' does not exist in the current context
// case _: // not a discard
Diagnostic
(
ErrorCode
.
ERR_NameNotInContext
,
"_"
).
WithArguments
(
"_"
).
WithLocation
(
11
,
18
),
// (21,15): error CS8059: Feature 'tuples' is not available in C# 6. Please use language version 7 or greater.
// M(out _);
Diagnostic
(
ErrorCode
.
ERR_FeatureNotAvailableInVersion6
,
"_"
).
WithArguments
(
"tuples"
,
"7"
).
WithLocation
(
21
,
15
),
// (12,17): warning CS0162: Unreachable code detected
// break;
Diagnostic
(
ErrorCode
.
WRN_UnreachableCode
,
"break"
).
WithLocation
(
12
,
17
),
// (17,17): warning CS0162: Unreachable code detected
// break;
Diagnostic
(
ErrorCode
.
WRN_UnreachableCode
,
"break"
).
WithLocation
(
17
,
17
)
);
}
[
Fact
]
public
void
SingleDiscardInAsyncAssignment
()
{
...
...
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