Mutant Solidity ERROR triggered when trying to mutate type(uint256)

[tomrpl]

In some snippets for instance here:

• https://github.com/morpho-org/morpho-blue-snippets/blob/main/src/morpho-blue/MorphoBlueSnippets.sol#L150

the mutants is view neither as KILLED nor LIVED but considered as an error with the terminal displaying:
"WARNING:root:Error: "

And the mutants pasted in an output file described as:

Mutation:
    File: /PATH_TO_REPO/morpho-blue-snippets/src/morpho-blue/MorphoBlueSnippets.sol
    Line nr: 149
    Result: Error
    Original line:
                 if (borrowed == 0) return type(uint256).max;

    Mutated line:
                 if (borrowed == 0) return max;```