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This silences warnings while loading the lexers containing overlapping character classes.
In https://bugs.ruby-lang.org/issues/21870, matz has indicated that this warning should be removed.
Unfortunately, we can't use a more surgical approach because the warning happens at parse time. So we have to disable warnings globally before loading the files.
Later, we can re-enable warnings for these files if RUBY_VERSION isn't one of the affected versions.
See also k-takata/Onigmo#175