# Regression Day 1.48/1.49 [All stable-to-beta regressions](https://github.com/rust-lang/rust/labels/regression-from-stable-to-beta) * regression: target_feature no longer permitted in some places [#78143](https://github.com/rust-lang/rust/issues/78143) * **unassigned** * regression: array methods unstable feature use [#78140](https://github.com/rust-lang/rust/issues/78140) * **unassigned** * regression: could not fully normalize type [#78139](https://github.com/rust-lang/rust/issues/78139) * assigned to Mark-Simulacrum * needs MCVE * `use dep1::foo as dep1` is considered ambiguous [#77586](https://github.com/rust-lang/rust/issues/77586) * assigned to Mark-Simulacrum * actively discussed by lang team * short term plan: revert injecting change * (and potentially, eventually, add a lint for the anti-pattern here) * longer term, we may want to change resolution static semantics for such cases, **on an edition boundary** * Macro hygiene change breaks Firefox builds. [#76480](https://github.com/rust-lang/rust/issues/76480) * **unassigned** * Injected by [PR #73084](https://github.com/rust-lang/rust/pull/73084) * pnkfelix thinks T-compiler collectively agreed with Aaron1011 and petrochenkov that this is expected breakage. * Do we have a relevant release note prepared for [PR #73084](https://github.com/rust-lang/rust/pull/73084)? * (It *is* tagged `relnotes` already) [All stable-to-nightly regressions](https://github.com/rust-lang/rust/labels/regression-from-stable-to-nightly) * ICE: non utf8 str from miri: Utf8Error -Zdump-mir-all #78520 * dynlib stopped building on nightly #78210 * New "warning incompatible with previous forbid in same scope" error #77713 * ICE on trying to debug format type #77458 * Build hang on Linux with nightly and beta toolchains [#76980](https://github.com/rust-lang/rust/issues/76980) * **unassigned** * a set of options were laid out [here](https://github.com/rust-lang/rust/issues/76980#issuecomment-704725529), but pnkfelix doesn't think anyone yet owns the decision nor responsibility * missing_fragment_specifier hard error in Rust 1.47 #76605 * Breaking change/regression in nightly? Hash of `Discriminant` now produces different results across CPU architectures #74215 [All stable-to-stable regressions](https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3Aregression-from-stable-to-stable)