> For the complete documentation index, see [llms.txt](https://guide.cronuszen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.cronuszen.com/gpcscripting/gpc-script-guide/troubleshooting/high-value-warnings.md).

# High-value warnings

### `GPC3004` — unreachable code

Remove code after unconditional `return`/flow termination or correct the branch.

***

### `GPC3005` / `GPC3006` — removed function/combo

The item is unreachable. Confirm this is intentional rather than a missing call.

***

### `GPC3009` — parameter shadows global

Rename the parameter. Inside the function, the parameter wins.

***

### `GPC3012..GPC3017` — const array fits narrower type

Use the suggested narrower signed/unsigned width when it preserves intended values.

***

### `GPC6014` — assignment in condition

```cpp
if(mode = 2) { }  // assignment
if(mode == 2) { } // comparison
```

***

### `GPC6015` / `GPC6016` — division/modulus becomes zero

Review integer truncation and operand order.

***

### `GPC6017` — shift out of range

Live bit positions are `0..31`.

***

### `GPC6018` — switch fallthrough

Add `break` or clearly document intentional fallthrough.

***

### `GPC6019..GPC6023` — unused/dead data

Remove genuinely unused runtime state, const data, or arguments. Unused const data still costs bytes.

***

### `GPC6030` — index call evaluated twice

Store a function result before indexing:

{% code title="store-index-before-use.gpc" lineNumbers="true" %}

```cpp
const int8 TABLE[] = { 10, 20, 30 };

int index;
int value;

main {
    index = choose_index();
    if(index >= 0 && index < sizeof(TABLE)) {
        value = TABLE[index];
    }
}

function choose_index() {
    return 0;
}
```

{% endcode %}

***

### `GPC6035` — possible stack overflow

Split giant nested expressions into intermediate globals, shorten deep call chains, and remove recursion. Globals and peak call/expression stack share the 1,024-slot VM ceiling; do not treat the 1,020 variable limit and 1,024 stack limit as independent pools.

***

### `GPC6036` — recursion

The compiler cannot prove worst-case stack depth. Prefer an iterative state machine.

***

### `GPC9002` — old sensitivity arguments

Use `sensitivity(identifier, midpoint, sensitivity)` only.


---

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