checkWarningUsed
Checks if warnings are used. Do not throw warnings, if necessary throw
errors instead. Using errors instead of warnings improves the robustness
of the code. Warnings cannot reliably be caught and handled and
therefore often accomplish little. The check ignores calling warning
for disabling, enabling, or querying a warning. This means that using
for example warning('off', 'matlab:my:identifier'); is not reported by
this check.
Limitations
This check also reports cases where a warning state is set using a variable. Consider the following example:
warningState = 'off';
warning(warningState, 'matlab:my:identifier');
The statements do not issue a warning when run, but this check reports the second statement.
This check also reports calls to warning when you have shadowed the
MATLAB-installed function with a local one..
Exemption tag: %@ok<WARNU>