[xsl] Matching two consecutive hyphens

OK, here's a plain old XSL question which seems like it ought to be easy.  And 
yet.

The XML I'm given as input occasionally includes two consecutive hyphens, which 
I need to test for and, if present, insert a line break.  However, two 
consecutive hyphens in a standard contains() test of course throws an error:

<xsl:if test="contains(.,'--')">...

What's a good way to check for those two consecutive hyphens?

Thanks

Michele
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