Auto merge of #74862 - mark-i-m:mv-compiler, r=petrochenkov

Move almost all compiler crates to compiler/

This PR implements https://github.com/rust-lang/compiler-team/issues/336 and moves all `rustc_*` crates from `src` to the new `compiler` directory.

`librustc_foo` directories are renamed to `rustc_foo`.
`src` directories are introduced inside `rustc_*` directories to mirror the scheme already use for `library` crates.

1 files changed, 57 insertions, 0 deletions

diff --git a/compiler/rustc_expand/src/lib.rs b/compiler/rustc_expand/src/lib.rs
new file mode 100644
index 00000000000..7f631cb71af
--- /dev/null
+++ b/compiler/rustc_expand/src/lib.rs
@@ -0,0 +1,57 @@
+#![feature(bool_to_option)]
+#![feature(cow_is_borrowed)]
+#![feature(crate_visibility_modifier)]
+#![feature(decl_macro)]
+#![feature(or_patterns)]
+#![feature(proc_macro_diagnostic)]
+#![feature(proc_macro_internals)]
+#![feature(proc_macro_span)]
+#![feature(try_blocks)]
+
+#[macro_use]
+extern crate rustc_macros;
+
+extern crate proc_macro as pm;
+
+mod placeholders;
+mod proc_macro_server;
+
+pub use mbe::macro_rules::compile_declarative_macro;
+crate use rustc_span::hygiene;
+pub mod base;
+pub mod build;
+#[macro_use]
+pub mod config;
+pub mod expand;
+pub mod module;
+pub mod proc_macro;
+
+crate mod mbe;
+
+// HACK(Centril, #64197): These shouldn't really be here.
+// Rather, they should be with their respective modules which are defined in other crates.
+// However, since for now constructing a `ParseSess` sorta requires `config` from this crate,
+// these tests will need to live here in the iterim.
+
+#[cfg(test)]
+mod tests;
+#[cfg(test)]
+mod parse {
+    #[cfg(test)]
+    mod tests;
+    #[cfg(test)]
+    mod lexer {
+        #[cfg(test)]
+        mod tests;
+    }
+}
+#[cfg(test)]
+mod tokenstream {
+    #[cfg(test)]
+    mod tests;
+}
+#[cfg(test)]
+mod mut_visit {
+    #[cfg(test)]
+    mod tests;
+}