Simplify some literal-value negations with u128::wrapping_neg
#151045
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…uwer Rollup of 15 pull requests Successful merges: - #148623 (Ignore `#[doc(hidden)]` items when computing trimmed paths for printing) - #150550 (Miscellaneous cleanups to borrowck related code) - #150879 (Remove the diagnostic lints) - #150895 (rustc_errors: Add (heuristic) Syntax Highlighting for `rustc --explain`) - #150987 (remote-test-server: Fix header in batch mode) - #151004 (std: implement `sleep_until` on Apple platforms) - #151045 (Simplify some literal-value negations with `u128::wrapping_neg`) - #151119 (Support pointers in type reflection) - #151171 (Do not recover from `Trait()` if generic list is unterminated) - #151231 (HIR typeck cleanup: clarify and re-style `check_expr_unop`) - #151249 (Parse ident with allowing recovery when trying to diagnose) - #151295 (THIR patterns: Use `ty::Value` in more places throughout `const_to_pat`) - #151326 (Remove `DiagMessage::Translated` in favour of `DiagMessage::Str`) - #151361 (add test for issue 61463) - #151371 (Add `S-blocked` to `labels_blocking_approval`) r? @ghost
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Rollup merge of #151045 - wrapping-neg, r=lcnr Simplify some literal-value negations with `u128::wrapping_neg` - Calling `overflowing_neg` and then discarding the overflow bit is the same as just calling `wrapping_neg`. - Casting to `u128` to `i128`, negating, and then casting back produces the same result as just performing an unsigned `wrapping_neg`. There should be no actual change to compiler behaviour.
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…uwer Rollup of 15 pull requests Successful merges: - rust-lang/rust#148623 (Ignore `#[doc(hidden)]` items when computing trimmed paths for printing) - rust-lang/rust#150550 (Miscellaneous cleanups to borrowck related code) - rust-lang/rust#150879 (Remove the diagnostic lints) - rust-lang/rust#150895 (rustc_errors: Add (heuristic) Syntax Highlighting for `rustc --explain`) - rust-lang/rust#150987 (remote-test-server: Fix header in batch mode) - rust-lang/rust#151004 (std: implement `sleep_until` on Apple platforms) - rust-lang/rust#151045 (Simplify some literal-value negations with `u128::wrapping_neg`) - rust-lang/rust#151119 (Support pointers in type reflection) - rust-lang/rust#151171 (Do not recover from `Trait()` if generic list is unterminated) - rust-lang/rust#151231 (HIR typeck cleanup: clarify and re-style `check_expr_unop`) - rust-lang/rust#151249 (Parse ident with allowing recovery when trying to diagnose) - rust-lang/rust#151295 (THIR patterns: Use `ty::Value` in more places throughout `const_to_pat`) - rust-lang/rust#151326 (Remove `DiagMessage::Translated` in favour of `DiagMessage::Str`) - rust-lang/rust#151361 (add test for issue 61463) - rust-lang/rust#151371 (Add `S-blocked` to `labels_blocking_approval`) r? @ghost
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…uwer Rollup of 15 pull requests Successful merges: - rust-lang/rust#148623 (Ignore `#[doc(hidden)]` items when computing trimmed paths for printing) - rust-lang/rust#150550 (Miscellaneous cleanups to borrowck related code) - rust-lang/rust#150879 (Remove the diagnostic lints) - rust-lang/rust#150895 (rustc_errors: Add (heuristic) Syntax Highlighting for `rustc --explain`) - rust-lang/rust#150987 (remote-test-server: Fix header in batch mode) - rust-lang/rust#151004 (std: implement `sleep_until` on Apple platforms) - rust-lang/rust#151045 (Simplify some literal-value negations with `u128::wrapping_neg`) - rust-lang/rust#151119 (Support pointers in type reflection) - rust-lang/rust#151171 (Do not recover from `Trait()` if generic list is unterminated) - rust-lang/rust#151231 (HIR typeck cleanup: clarify and re-style `check_expr_unop`) - rust-lang/rust#151249 (Parse ident with allowing recovery when trying to diagnose) - rust-lang/rust#151295 (THIR patterns: Use `ty::Value` in more places throughout `const_to_pat`) - rust-lang/rust#151326 (Remove `DiagMessage::Translated` in favour of `DiagMessage::Str`) - rust-lang/rust#151361 (add test for issue 61463) - rust-lang/rust#151371 (Add `S-blocked` to `labels_blocking_approval`) r? @ghost
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overflowing_negand then discarding the overflow bit is the same as just callingwrapping_neg.u128toi128, negating, and then casting back produces the same result as just performing an unsignedwrapping_neg.There should be no actual change to compiler behaviour.