Merge #3842

3842: Add lib-proc-macro mod in ra_proc_macro_srv r=matklad a=edwin0cheng

This PR add a module in ra_proc_macro_srv, which is just copy & paste from rustc lib_proc_macro and remove all unstable features in it. 

The main idea here is by doing that, we could build the `ra_proc_macro_srv` without nightly compiler and remain ABI compatibility. 

Co-authored-by: Edwin Cheng <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/crates/ra_proc_macro_srv/src/lib.rs b/crates/ra_proc_macro_srv/src/lib.rs
index f77be1475..80cfa1174 100644
--- a/crates/ra_proc_macro_srv/src/lib.rs
+++ b/crates/ra_proc_macro_srv/src/lib.rs
@@ -10,6 +10,11 @@
 //! * By **copying** the whole rustc `lib_proc_macro` code, we are able to build this with `stable`
 //!   rustc rather than `unstable`. (Although in gerenal ABI compatibility is still an issue)
 
+#[allow(dead_code)]
+#[doc(hidden)]
+mod proc_macro;
+
+use proc_macro::bridge::client::TokenStream;
 use ra_proc_macro::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTask};
 
 pub fn expand_task(_task: &ExpansionTask) -> Result<ExpansionResult, String> {