more clippy fixes
* remove redundant returns (clippy::needless_return)
* remove redundant import (clippy::single_component_path_imports)
* remove redundant format!() call (clippy::useless_format)
* don't use ok() before calling expect() (clippy::ok_expect)
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| .. | ||
| lexer | ||
| parser | ||
| Cargo.toml | ||
| lib.rs | ||
| validate_attr.rs | ||