Function StringExitWith

engine/Evaluator/express.cpp:883–898

if (cond) exitWith { code } — evaluates code when cond is true, stores the value in tls_exitWithValue, and signals EvalBreak to stop further statement execution in the current scope. Loop handlers (ForDoOp, StringRepeat) catch EvalBreak, clear it, and use tls_exitWithValue as the loop's return value. At top level (no enclosing loop), EvaluateMultiple captures the value when it sees EvalBreak so t

// At top level (no enclosing loop), EvaluateMultiple captures the value when
// it sees EvalBreak so the tri runner still receives "FAIL:..." strings.
static GameValue StringExitWith(const GameState* state, GameValuePar oper1, GameValuePar oper2)
{
    bool test = oper1;
    if (test)
    {
        GameVarSpace local(state->GetContext());
        state->BeginContext(&local);
        RString expression = oper2;
        GameValue ret = state->EvaluateMultiple(expression);
        state->EndContext();
        tls_exitWithValue = ret;
        const_cast<GameState*>(state)->SetError(EvalBreak);
        return ret;
    }
    return NOTHING;
}

// --- for / from / to / step / do (for-loop variant) -------------------------