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Ben Boeckel authored
While `|` would be preferred, in macros, `expr` matches may include `|` and therefore may not be followed by `|`. The only other options are `,`, `;`, or `=>`. The comma is already used for separating variants and the arrow for the variant/string separation. Semicolon is the only one left, but it is also used for "or" in Prolog.
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