Yes, actually. Perl uses one to handle cases of ambiguous syntax, where it's possible to "guess" the correct parse quite reliably from the surrounding context, but it's impossible to infer the true meaning simply by looking at the line by itself. (Thankfully, this technique is rare if you're writing clean code, and as far as I know, it's gone from Perl 6.)
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Yes, actually. Perl uses one to handle cases of ambiguous syntax, where it's possible to "guess" the correct parse quite reliably from the surrounding context, but it's impossible to infer the true meaning simply by looking at the line by itself. (Thankfully, this technique is rare if you're writing clean code, and as far as I know, it's gone from Perl 6.)