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Process string specifications of enabling/disabling warnings,
as passed to the --warn option or the SetOption('warn') function.
An argument to this option should be of the form <warning-class>
or no-<warning-class>. The warning class is munged in order
to get an actual class name from the classes above, which we
need to pass to the {enable,disable}WarningClass() functions.
The supplied <warning-class> is split on hyphens, each element
is capitalized, then smushed back together. Then the string
"Warning" is appended to get the class name.
For example, 'deprecated' will enable the DeprecatedWarning
class. 'no-dependency' will disable the DependencyWarning class.
As a special case, --warn=all and --warn=no-all will enable or
disable (respectively) the base Warning class of all warnings.
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