b28721fd96
Improved code with clippy
I haven't used the bootstrapped compiler, but I think I have made some improvements using clippy. I have already made the following changes to the compiler:
Replaced `self.first().is_digit(10)` with `self.first().is_ascii_digit()` on lines 633, 664, and 680 of compiler/rust_lexer/src/lib.rs.
Removed unnecessary cast on line 262 of compiler/rustc_lexer/src/unescape.rs
Replaced ok_or_else with ok_or on line 303 of compiler/rustc_lexer/src/unescape.rs
Replaced `!std::env::var("RUSTC_BOOTSTRAP").is_ok()` with `std::env::var("RUSTC_BOOTSTRAP").is_err()` on line 4 of compiler/rustc_macros/build.rs
Removed needless borrow for generic argument `env`on line 53 of compiler/rust_llvm/build.rs
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