private static SyntaxTokenList FixMethodModifiers(SyntaxTokenList modifiers, ref TypeSyntax newReturnType)
{
var asyncTokenIndex = modifiers.IndexOf(SyntaxKind.AsyncKeyword);
SyntaxTokenList newModifiers;
if (asyncTokenIndex == 0)
{
// Have to move the trivia on the async token appropriately.
var asyncLeadingTrivia = modifiers[0].LeadingTrivia;
if (modifiers.Count > 1)
{
// Move the trivia to the next modifier;
newModifiers = modifiers.Replace(
modifiers[1],
modifiers[1].WithPrependedLeadingTrivia(asyncLeadingTrivia));
newModifiers = newModifiers.RemoveAt(0);
}
else
{
// move it to the return type.
newModifiers = modifiers.RemoveAt(0);
newReturnType = newReturnType.WithPrependedLeadingTrivia(asyncLeadingTrivia);
}
}
else
{
newModifiers = modifiers.RemoveAt(asyncTokenIndex);
}
return(newModifiers);
}