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Alan Zimmerman authored
An unboxed tuple such as (# | b | | | | | #) Ends up in the parser via `tup_exprs` as Sum 2 7 lexp where `lexp` is a `LHsExpr` From an API annotation perspective, the 5 `AnnVbar`s after the `b` were attached to `lexp`, but the leading `AnnVbar`s did not have a home. This patch attaches them all to the the parent tuple expression. The first (alt - 1) of them come before `lexp`, and the remaining (arity - alt) come after. Test Plan: ./validate Reviewers: osa1, austin, bgamari Subscribers: thomie, mpickering Differential Revision: https://phabricator.haskell.org/D2968 GHC Trac Issues: #12417
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