@Override
protected ASTNode doParseContents(@NotNull ASTNode chameleon, @NotNull PsiElement psi) {
final PsiBuilderFactory factory = PsiBuilderFactory.getInstance();
final PsiBuilder psiBuilder = factory.createBuilder(((TreeElement)chameleon).getManager().getProject(), chameleon);
final PsiBuilder builder = adapt_builder_(DartTokenTypes.STATEMENTS, psiBuilder, new DartParser(), DartParser.EXTENDS_SETS_);
PsiBuilder.Marker marker = enter_section_(builder, 0, _COLLAPSE_, "<code fragment>");
boolean result = DartParser.expression(builder, 0);
exit_section_(builder, 0, marker, DartTokenTypes.STATEMENTS, result, true, TRUE_CONDITION);
return builder.getTreeBuilt();