# E0054

Warning name: `ambiguous_range_direction`

The direction of an inclusive range is ambiguous.

This warning is emitted when an inclusive range such as `10..=0` is used in a
loop. The endpoints suggest a descending loop, but the range syntax does not
make the direction explicit.

## Erroneous example

```{literalinclude} /sources/error_codes/0054_error/top.mbt
:language: moonbit
```

## Suggestion

Use explicit descending range syntax when the loop should count down.

```{literalinclude} /sources/error_codes/0054_fixed/top.mbt
:language: moonbit
```