jackfirth / resyntax / #433

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Pull #793

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Add rules replacing call-with-output-file with display-to-file

Adds two rules to the file-io-suggestions suite. A call-with-output-file
expression whose procedure just displays a value to the port is
rewritten to display-to-file, and one whose procedure consists of
displayln calls is rewritten to display-lines-to-file. The rules only
fire when the port is used as nothing but the last argument of the
display calls, and Resyntax's existing binding correctness check
discards the suggestions in modules that don't import racket/file.

Fixes #673.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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