Disallow null checking discard parameters #58952
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davidwengier
approved these changes
Jan 20, 2022
jcouv
reviewed
Jan 20, 2022
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| class C | ||
| { | ||
| Action<string> lambda = _ => |
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Please test the scenario with two underscores. A single underscore is not a discard.
https://github.com/dotnet/csharplang/blob/main/proposals/csharp-9.0/lambda-discard-parameters.md #Closed
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Have added the test, thanks.
jcouv
reviewed
Jan 20, 2022
| { | ||
| public C() | ||
| { | ||
| Func<string, int> f = ([||]_) => { return 0; }; |
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See TestOnDiscardLambdaParameter2
jcouv
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Jan 20, 2022
cston
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Jan 20, 2022
| Diagnostic(ErrorCode.ERR_DiscardCannotBeNullChecked, "_").WithLocation(8, 46), | ||
| // (8,51): error CS8990: Discard parameter cannot be null-checked. | ||
| // public Action<string, string> action3 = (_!!, _!!) => { }; // 3, 4 | ||
| Diagnostic(ErrorCode.ERR_DiscardCannotBeNullChecked, "_").WithLocation(8, 51)); | ||
| } |
cston
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Jan 20, 2022
ghost
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333fred
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* upstream/main: (1035 commits) Add missing header Mark IVSTypeScriptFormattingServiceImplementation as optional, but require it in the constructor Fix Go To Base for a symbol with a single metadata location (dotnet#58965) [EnC] Store entire spans instead of line deltas (dotnet#58831) Delete CodeAnalysisRules.ruleset (dotnet#58968) Allow xml docs to still be created when 'emit metadata only' is on. (dotnet#57667) Fix ParseVBErrorOrWarning (dotnet#47833) Update parameter nullability to match implementation Ensure CSharpUseParameterNullCheckingDiagnosticAnalyzer works with nullable parameters Add tests for issues fixed by previous PR (dotnet#58764) Update src/Features/CSharp/Portable/Completion/CompletionProviders/ExplicitInterfaceMemberCompletionProvider.CompletionSymbolDisplay.cs Disallow null checking discard parameters (dotnet#58952) Add extension method Escape type arguments Few fixes Update tests. Add Analyzers layer to CODEOWNERS Add formatting analyzer test for param nullchecking (dotnet#58936) Move reading HideAdvancedMembers option up (dotnet#58747) List patterns: Slice value is assumed to be never null (dotnet#57457) ...
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Related to #36024