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Old syntax was deprecated 6 years ago in this commit 432b9c93 by simonpj:"New syntax for GADT-style record declarations, and associated refactoring" discussed in Trac #3306. This patch removes 2 reduce/reduce conflicts in parser. Conflicting productions were: ``` gadt_constr -> con_list '::' sigtype gadt_constr -> oqtycon '{' fielddecls '}' '::' sigtype ``` Recursive inlining of `con_list` and `oqtycon` helped reveal the conflict: ``` gadt_constr -> '(' CONSYM ')' '::' sigtype gadt_constr -> '(' CONSYM ')' '{' fielddecls '}' '::' sigtype ``` between two types of GADT constructors (second form stands for deprecated syntax). Test Plan: `make fasttest`, one breakage TEST="records-fail" (parse error instead of typecheck error due to removal of deprecated syntax). Updated test. Reviewers: simonmar, bgamari, austin, simonpj Reviewed By: simonpj Subscribers: thomie, mpickering, trofi Differential Revision: https://phabricator.haskell.org/D1118 GHC Trac Issues: #3306
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