Magic value 3 is used to create state for a yield point. It is in fact
the number of reserved variants.

Lift RESERVED_VARIANTS out to module scope and use it instead.

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

…vidtwco

Drop magic value 3 from code

Magic value 3 is used to create state for a yield point. It is in fact
the number of reserved variants.

Lift RESERVED_VARIANTS out to module scope and use it instead.

…m, r=oli-obk

Don't omit comma when suggesting wildcard arm after macro expr

* Also adds `Span::eq_ctxt` to consolidate the various usages of `span.ctxt() == other.ctxt()`
* Also fixes an unhygenic usage of spans which caused the suggestion to render weirdly when we had one arm match in a macro
* Also always suggests a comma (i.e. even after a block) if we're rendering a wildcard arm in a single-line match (looks prettier 🌹)

Fixes rust-lang#94866

… r=oli-obk

Mention formatting macros when encountering `ArgumentV1` method in const

Also open to just closing this if it's overkill. There are a lot of other distracting error messages around, so maybe it's not worth fixing just this one.

Fixes rust-lang#93665

…ink, r=Dylan-DPC

Add a link to the unstable book page on Generator doc comment

This makes it easier to jump into the Generator section on the unstable book.

Signed-off-by: Yuki Okushi <jtitor@2k36.org>