jackfirth / resyntax / #427

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Pull #791

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Only match syntax-wrapped outputs in define-syntax-parser shortcut

The define-syntax-parser-to-define-syntax-parse-rule-simple rule
matched any single-clause define-syntax-parser and stripped a syntax
wrapper from body forms only if one was present. A clause body ending
in (syntax/loc ...) or any other non-template expression got inserted
into the define-syntax-parse-rule output as a raw template, producing
broken code. Now the rule only matches when the last body form is
wrapped in syntax, with preceding forms matched as pattern directives,
mirroring the define-syntax rule in the same module.

Fixes #759.

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

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