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);
_typeSyntaxOpt = typeSyntax?.GetReference();
}