internal GlobalExpressionVariable(
     SourceMemberContainerTypeSymbol containingType,
     DeclarationModifiers modifiers,
     TypeSyntax typeSyntax,
     string name,
     SyntaxReference syntax,
     Location location)
     : base(containingType, modifiers, name, syntax, location)
 {
     Debug.Assert(DeclaredAccessibility == Accessibility.Private);
     _typeSyntax = typeSyntax.GetReference();
 }