Merge #1815

1815: Support correct `$crate` expansion in macros r=uHOOCCOOHu a=uHOOCCOOHu

This PR makes normal use cases of `$crate` from macros work as expected.

It makes more macros from `std` work. Type inference works well with `panic`, `unimplemented`, `format`, and maybe more.
Sadly that `vec![1, 2, 3]` still not works, but it is not longer an issue about macro.

Screenshot:
![Screenshot_20190927_022136](https://user-images.githubusercontent.com/14816024/65714465-b4568f80-e0cd-11e9-8043-dd44c2ae8040.png)




Co-authored-by: uHOOCCOOHu <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/ra_hir/src/code_model/src.rs b/crates/ra_hir/src/code_model/src.rs
index c0cb27b47..dc964e156 100644
--- a/crates/ra_hir/src/code_model/src.rs
+++ b/crates/ra_hir/src/code_model/src.rs
@@ -119,7 +119,7 @@ impl HasSource for TypeAlias {
 impl HasSource for MacroDef {
     type Ast = ast::MacroCall;
     fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::MacroCall> {
-        Source { file_id: self.id.0.file_id(), ast: self.id.0.to_node(db) }
+        Source { file_id: self.id.ast_id.file_id(), ast: self.id.ast_id.to_node(db) }
     }
 }