dotnet/roslyn
Ver no GitHubSemantic model: Should GetSymbolInfo on `var _` return an IDiscardSymbol?
Open
#16.316 aberto em 7 de jan. de 2017
Area-CompilersFeature - TuplesFeature Requesthelp wanted
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Description
Currently, GetSymbolInfo will return null in this case.
The only scenario where a discard symbol is returned is with the _ identifier/expression.
[Fact]
public void VariousDiscardsInForeach()
{
var source =
@"
class C
{
static void Main()
{
foreach ((var _, int _, _, var (_, _), int x) in new[] { (1L, 2, 3, (""hello"", 5), 6) })
{
System.Console.Write(x);
}
}
}
";
var comp = CreateCompilationWithMscorlib(source, options: TestOptions.DebugExe, references: s_valueTupleRefs);
var tree = comp.SyntaxTrees.First();
var model = comp.GetSemanticModel(tree);
var discard1 = GetDiscardDesignations(tree).First();
Assert.Null(model.GetSymbolInfo(declaration1).Symbol); // should return a discard symbol instead?
}
FYI @AlekseyTs @gafter Related to https://github.com/dotnet/roslyn/pull/16153