Merge #1796

1796: Support completion for macros r=matklad a=uHOOCCOOHu

This is based on #1795 , and fixes #1727 

Also prettify hover text of macros.

Some screenshorts below:

Completion in item place.
<img width="416" alt="Screenshot_20190910_134056" src="https://user-images.githubusercontent.com/14816024/64587159-fa72da00-d3d0-11e9-86bb-c98f169ec08d.png">

After pressing `tab`.
<img width="313" alt="Screenshot_20190910_134111" src="https://user-images.githubusercontent.com/14816024/64587160-fa72da00-d3d0-11e9-9464-21e3f6957bd7.png">

Complete macros from `std`.
<img width="588" alt="Screenshot_20190910_134147" src="https://user-images.githubusercontent.com/14816024/64587161-fb0b7080-d3d0-11e9-866e-5161f0d1b546.png">

Hover text.
<img width="521" alt="Screenshot_20190910_134242" src="https://user-images.githubusercontent.com/14816024/64587162-fb0b7080-d3d0-11e9-8f09-ad17e3f6702a.png">



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

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/ra_hir/src/ty/tests.rs b/crates/ra_hir/src/ty/tests.rs
index c60e72abf..869ae13f1 100644
--- a/crates/ra_hir/src/ty/tests.rs
+++ b/crates/ra_hir/src/ty/tests.rs
@@ -2839,7 +2839,7 @@ fn main() {
 }
 
 #[test]
-fn infer_path_quantified_macros_expanded() {
+fn infer_path_qualified_macros_expanded() {
     assert_snapshot!(
         infer(r#"
 #[macro_export]