This reverts commit dab560ffcf1b97a60748bc8ebfebee204df3f0bc.

This reverts commit d652f0ea588ecdf96d31a86fcc9aaa5f78f734a2.

This reverts commit 8fbd19d.

The final return value doesn't need to be tried at all -- we can just
return the checked option directly. The optimizer can probably figure
this out anyway, but there's no need to make it work here.

… r=oli-obk

Filtering spans when emitting json

According to the issue rust-lang#102902, we shouldn't emit spans which have an empty span and no suggested replacement.

…tmandry

Adding `fuchsia-ignore` and `needs-unwind` to compiler test cases

Final tests covering missing privileges

r? `@tmandry`

cc. `@djkoloski`

Make diagnostic for unsatisfied `Termination` bounds more precise

Don't blindly emit a diagnostic claiming that “*`main` has an invalid return type*” if we encounter a type that should but doesn't implement `std::process::Termination` and isn't actually the return type of the program entry `main`.

Fixes rust-lang#103052.

`@rustbot` label A-diagnostics T-compiler T-libs
r? diagnostics

…-Simulacrum

Fix typo in `ReverseSearcher` docs

…=Mark-Simulacrum

Remove the redundant `Some(try_opt!(..))` in `checked_pow`

The final return value doesn't need to be tried at all -- we can just
return the checked option directly. The optimizer can probably figure
this out anyway, but there's no need to make it work here.

Stabilize asm_sym

Tracking issue rust-lang#93333

Reference PR: rust-lang/reference#1270