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Treats all input to \{Haml::Helpers#haml\_concat} within the block
as being HTML safe for Rails' XSS protection.
This is useful for wrapping blocks of code that concatenate HTML en masse.

This has no effect if Rails' XSS protection isn't enabled.

@yield A block in which all input to `#haml_concat` is treated as raw.
@see Haml::Util#rails_xss_safe?
Please help! Open an issue on GitHub if this assessment is incorrect.