Jana Dönszelmann
1fe488638b
Uniform `enter_trace_span!` and add documentation 1. The latest changes to `enter_trace_span!` were ported from Miri (see https://github.com/rust-lang/miri/pull/4452#discussion_r2204958019), so now both the `rustc_const_eval` and the Miri macro accept the same syntax. Furthermore, the Miri macro was changed to just call rustc_const_eval`'s, to avoid duplication. 2. I made the `layout_of` (& friends) calls use that new syntax, e.g. `enter_trace_span!(layouting::layout_of, ...)` 3. I made sure the macro specifies all types/traits/macros it refers to using `$crate::`, so the macro works anywhere independently of which types/traits/macros are imported in the context it is used in. 4. I added documentation, examples and tips to the macro's doc. To make the rustdoc compile I had to add some hidden lines (`#`), but now it acts as a compilation test which will avoid reintroducing issue 3. in the future. I will also create a documentation file with everything one needs to know about tracing at a later point, but I figured adding some of that info directly on the tracing macro makes it more discoverable. 5. In `stack.rs` I made it so that the `"frame"` span has a field named "frame" (instead of "message") with the data about the frame. This field used to be called "message" (tracing's default) since it was previously formatted using `"{}", instance`, and now I replaced it with `frame = %instance`.
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