result code = -1
standard error = {
tests/diagnostics/interfaces/mutating-impl-of-non-mutating-req.slang(14): error 38105: member 'processValue' does not match interface requirement.
    [mutating] int processValue(int inValue)
                   ^~~~~~~~~~~~
tests/diagnostics/interfaces/mutating-impl-of-non-mutating-req.slang(7): note: see interface requirement declaration of 'processValue'
    int processValue(int inValue);
        ^~~~~~~~~~~~
}
standard output = {
}