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Don't get confused by an unmatched right brace in the input. (Previously, this led to discarding information about file-level variables and then possibly crashing.) Detect, rather than crash on, an attempt to index into a non-array variable. As before, in the absence of field complaints I'm not too excited about back-patching these. Per valgrind testing by Alexander Lakhin. Discussion: https://postgr.es/m/a239aec2-6c79-5fc9-9272-cea41158a360@gmail.com