Eshell: Mostly cosmetic changes to be more explicit about dynbind
* lisp/eshell/em-dirs.el (eshell-dirs-initialize): Reveal the lambdas. (eshell-expand-multiple-dots): Fix ^+$ => \`+\' in the regexp. * lisp/eshell/esh-cmd.el (eshell-this-command-hook): Declare as dynamically scoped. (eshell-trap-errors): Use `mapc funcall` since this can't have global/local settings like a true hook. (eshell-do-eval): Split the `let` case from the rest so we can use `cl-progv` rather than `eval` for it. (eshell/which): Use `fboundp` test instead of ugly gymnastics to try and hide the function call from the compiler. * lisp/eshell/esh-var.el (eshell-variable-aliases-list): Reveal the lambdas. (eshell-parse-variable-ref): Use backquotes.
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