Add support for doc on hover for macro 2.0

Author: edwin0cheng

crates/ide/src/hover.rs

@@ -1234,6 +1234,37 @@ fn f() { fo$0o!(); }
         )
     }
 
+    #[test]
+    fn test_hover_macro2_invocation() {
+        check(
+            r#"
+/// foo bar
+///
+/// foo bar baz
+macro foo() {}
+
+fn f() { fo$0o!(); }
+"#,
+            expect![[r#"
+                *foo*
+
+                ```rust
+                test
+                ```
+
+                ```rust
+                macro foo
+                ```
+
+                ---
+
+                foo bar
+
+                foo bar baz
+            "#]],
+        )
+    }
+
     #[test]
     fn test_hover_tuple_field() {
         check(

crates/syntax/src/parsing/text_tree_sink.rs

@@ -147,8 +147,8 @@ fn n_attached_trivias<'a>(
     trivias: impl Iterator<Item = (SyntaxKind, &'a str)>,
 ) -> usize {
     match kind {
-        MACRO_CALL | MACRO_RULES | CONST | TYPE_ALIAS | STRUCT | UNION | ENUM | VARIANT | FN
-        | TRAIT | MODULE | RECORD_FIELD | STATIC | USE => {
+        MACRO_CALL | MACRO_RULES | MACRO_DEF | CONST | TYPE_ALIAS | STRUCT | UNION | ENUM
+        | VARIANT | FN | TRAIT | MODULE | RECORD_FIELD | STATIC | USE => {
             let mut res = 0;
             let mut trivias = trivias.enumerate().peekable();