Merge #3727

3727: Introduce ra_proc_macro r=matklad a=edwin0cheng

This PR implemented:

1.  Reading dylib path of proc-macro crate from cargo check , similar to how `OUTDIR` is obtained.
2.  Added a new crate `ra_proc_macro` and implement the foot-work for reading result from external proc-macro expander. 
3. Added a struct `ProcMacroClient` , which will be responsible to the client side communication to the External process.



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

1 files changed, 2 insertions, 0 deletions

diff --git a/crates/ra_ide/src/mock_analysis.rs b/crates/ra_ide/src/mock_analysis.rs
index 2cf77a31f..2c13f206a 100644
--- a/crates/ra_ide/src/mock_analysis.rs
+++ b/crates/ra_ide/src/mock_analysis.rs
@@ -103,6 +103,7 @@ impl MockAnalysis {
                     cfg_options,
                     Env::default(),
                     Default::default(),
+                    Default::default(),
                 ));
             } else if path.ends_with("/lib.rs") {
                 let crate_name = path.parent().unwrap().file_name().unwrap();
@@ -113,6 +114,7 @@ impl MockAnalysis {
                     cfg_options,
                     Env::default(),
                     Default::default(),
+                    Default::default(),
                 );
                 if let Some(root_crate) = root_crate {
                     crate_graph