* lisp/pcomplete.el: Convert to lexical binding and fix bug#8819.
(pcomplete-suffix-list): Mark as obsolete. (pcomplete-completions-at-point): Capture pcomplete-norm-func and pcomplete-seen in the closure. (pcomplete-comint-setup): Setup completion-at-point as well. (pcomplete--entries): New function. (pcomplete--env-regexp): New var. (pcomplete-entries): Rewrite to work with partial-completion and without relying on pcomplete-suffix-list. (pcomplete-pare-list): Remove, unused. * lisp/shell.el (shell-completion-vars): Set pcomplete-termination-string according to comint-completion-addsuffix.
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