Rollup merge of #57417 - QuietMisdreavus:semi-revert-doctest-parsing, r=GuillaumeGomez

rustdoc: use text-based doctest parsing if a macro is wrapping main

This is a "forward-port" of https://github.com/rust-lang/rust/pull/57019, intended to get https://github.com/rust-lang/rust/issues/56898 on nightly, since it's now fixed on beta (and already worked on stable).

To recap:

* The libsyntax-based doctest parsing now checks to see whether there is a top-level macro invocation in the doctest while it's checking for `fn main` and an `extern crate` statement.
* If it finds a macro invocation and *didn't* find `fn main`, then it performs the older text-based scan to allow doctests like the ones in `allocator_api` to still compile.

A "proper" fix will involve changing how `make_test` works to call it later in the `run_test` function, after the initial steps of compilation have completed. I've filed [a separate issue](https://github.com/rust-lang/rust/issues/57415) for that, though.

0 files changed, 0 insertions, 0 deletions