Ben Greenman d52c845454 racket/file: check file-exists? ... Check `file-exists?` before passing the file on to `file-size` and/or `open-input-file`. The latter led to confusing error messages, e.g.: ``` (file->string "DNE") ;; file-size: cannot get size ``` affects: `file->value` `file->list` `file->string` `file->bytes` `file->lines` `file->bytes-lines`		2020-05-08 08:27:33 -04:00
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collects	racket/file: check file-exists?	2020-05-08 08:27:33 -04:00
src	bc: fix potential GC problem with continuation invocation	2020-05-07 16:18:25 -06:00
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