This test exists so closing

roslyn/src/Compilers/CSharp/Test/Semantic/Semantics/NullCheckedParameterTests.cs

Lines 21 to 33 in e5e5d21

    
                   public void NullCheckedDelegateDeclaration() 
        
                   { 
        
                       var source = @" 
        
           delegate void Del(string x!!, int y); 
        
           class C 
        
           { 
        
               Del d = delegate(string k!!, int j) { /* ... */ }; 
        
           }"; 
        
                       CreateCompilation(source, parseOptions: TestOptions.RegularPreview).VerifyDiagnostics( 
        
                               // (2,26): error CS8714: Parameter 'x' can only have exclamation-point null checking in implementation methods. 
        
                               // delegate void Del(int x!!, int y); 
        
                               Diagnostic(ErrorCode.ERR_MustNullCheckInImplementation, "x").WithArguments("x").WithLocation(2, 26)); 
        
                   }

	public void NullCheckedDelegateDeclaration()
	{
	var source = @"
	delegate void Del(string x!!, int y);
	class C
	{
	Del d = delegate(string k!!, int j) { /* ... */ };
	}";
	CreateCompilation(source, parseOptions: TestOptions.RegularPreview).VerifyDiagnostics(
	// (2,26): error CS8714: Parameter 'x' can only have exclamation-point null checking in implementation methods.
	// delegate void Del(int x!!, int y);
	Diagnostic(ErrorCode.ERR_MustNullCheckInImplementation, "x").WithArguments("x").WithLocation(2, 26));
	}

Parameter null checking needs to ensure testing for use in delegate parameters #58323

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