giles e667d3bc51 HS: parse-cmd at-end? guard + catch do-wrap fix asyncError (+2 tests) ...

- parser.sx: parse-cmd true-fallback returns nil when at-end? instead of
  calling parse-expr at EOF — fixes trailing 'then' causing compilation
  error for 'on ... then' terminated handlers
- compiler.sx: catch-without-finally branch wraps guard+reraise in do so
  both expressions are sequenced inside the let binding

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-05 16:30:03 +00:00

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