NodeResult<? extends IDeclaration> declResult = parseDeclaration(true);
IDeclaration decl = declResult.node;
if(decl instanceof DeclarationMixinString) {
DeclarationMixinString declarationMixinString = (DeclarationMixinString) decl;
// Check if ";" was consumed
if(declResult.ruleBroken) {
// If not, then this could have been parsed as an expression, retry with expression rule.
ExpMixinString expMixinString = declarationMixinString.exp;