checker: disallow assigning mutable reference to immutable ParExpr #18420
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fixes #18414
🤖 Generated by Copilot at 366f838
This pull request improves the parsing, formatting, and checking of prefix operators and reference assignments in V. It removes unnecessary parenthesis, fixes a checker bug, and deletes a redundant test file.
🤖 Generated by Copilot at 366f838
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prefix operator from formatter to parser (link)&
prefix operator from formatter (link)module_ref_type_keep.vv
that is no longer relevant (link)