# LevelMaxRhs::type-mismatch


**Key:** `LevelMaxRhs::type-mismatch`

**Category:** universe · **Severity:** error

**Source:** [`src/diag/hints.nix:924`](https://github.com/kleisli-io/nix-effects/blob/main/src/diag/hints.nix#L924)

the right operand of `max` must be a Level

## Example

`Hint::LevelMaxRhs::type-mismatch` means the `LevelMaxRhs` position supplies a term whose type does not match the expected type. The example shows the failing form first, then one way to give the checker the missing structure.

```nix
# Bad: max's right operand is not a Level.
levelMax level0 nat

# Better: both operands are levels.
levelMax level0 level1

```


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