Improve the abstract syntax for tokens #307
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This prepares us to fix the AST for this purpose
Instead of deferring the handling of `$$` to the backends, properly parse the `$$` syntax up front, and store the result in the AST. Note that the GLR backend was improperly substituting the `$$` twice. Now that we have better types, this was surfaced as type error, and then removed. Fixes haskell#295
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Instead of deferring the handling of
$$to the backends, properly parse the$$syntax up front, and store the result in the AST.Note that the GLR backend was improperly substituting the
$$twice. Now that we have better types, this was surfaced as type error, and then removed.Fixes #295