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When the PascalCase conversion of a field name is empty (for example an empty identifier or a name consisting only of underscores), camelCase rename must not index into that string. Return the original field name instead. Add a regression case to rename_fields.
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Summary
camelCasefield renaming when PascalCase yields an empty string (e.g. empty or underscore-only identifiers), avoiding an out-of-bounds slice panic.rename_fieldsunit test with an empty field name case.Test plan
cargo test -p serde_derive rename_fields