Exception in CSharpInlineMethodRefactoringProvider when multiple fields are declared in a field declaration

[jhinder]

Version Used: VS 17.12.2

Steps to Reproduce:

static class C
{
    static readonly object A = M(),
                           B = M();

    private static object M() => null!;
}

Place the caret at some location in the RHS of any of the field assignment expressions. If the exception doesn't yet occur, try opening the lightbulb menu.

Expected Behavior: No exception.

Actual Behavior:

System.InvalidOperationException : Sequence contains more than one element
   at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
   at Microsoft.CodeAnalysis.InlineMethod.AbstractInlineMethodRefactoringProvider`4.GetCallerSymbol(TInvocationSyntax calleeMethodInvocationNode,SemanticModel semanticModel,CancellationToken cancellationToken)
   at async Microsoft.CodeAnalysis.InlineMethod.AbstractInlineMethodRefactoringProvider`4.ComputeRefactoringsAsync[TMethodDeclarationSyntax,TStatementSyntax,TExpressionSyntax,TInvocationSyntax](<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.CodeRefactorings.CodeRefactoringService.<>c__DisplayClass12_0.<GetRefactoringFromProviderAsync>b__0(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.Extensions.IExtensionManagerExtensions.PerformFunctionAsync[T](<Unknown Parameters>)