Merge #3677

3677: Add support for macro in symbol_index r=kjeremy a=edwin0cheng

This PR allows macro showing up in `Open symbol` search:

![show_macro](https://user-images.githubusercontent.com/11014119/77244297-548d0b80-6c4e-11ea-8613-15926cc297b3.png)


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

1 files changed, 12 insertions, 1 deletions

diff --git a/crates/ra_syntax/src/ast/extensions.rs b/crates/ra_syntax/src/ast/extensions.rs
index c3ae8f90e..392731dac 100644
--- a/crates/ra_syntax/src/ast/extensions.rs
+++ b/crates/ra_syntax/src/ast/extensions.rs
@@ -4,7 +4,7 @@
 use itertools::Itertools;
 
 use crate::{
-    ast::{self, child_opt, children, AstNode, AttrInput, SyntaxNode},
+    ast::{self, child_opt, children, AstNode, AttrInput, NameOwner, SyntaxNode},
     SmolStr, SyntaxElement,
     SyntaxKind::*,
     SyntaxToken, T,
@@ -514,3 +514,14 @@ impl ast::Visibility {
         self.syntax().children_with_tokens().any(|it| it.kind() == T![super])
     }
 }
+
+impl ast::MacroCall {
+    pub fn is_macro_rules(&self) -> Option<ast::Name> {
+        let name_ref = self.path()?.segment()?.name_ref()?;
+        if name_ref.text() == "macro_rules" {
+            self.name()
+        } else {
+            None
+        }
+    }
+}