Merge #1793

1793: Fix outer doc-comments of `macro_rules` r=matklad a=uHOOCCOOHu

Document comments of `macro_rules!` is currently parsed outside the `MACRO_CALL` node,
which makes `DocCommentsOwner::doc_comments()` always empty.

For the input:
```rust
/// Some docs
macro_rules! foo {
    () => {};
}
```

Current parsing tree is:
```
SOURCE_FILE
  COMMENT    // <- This should be children of MACRO_CALL
  WHITESPACE
  MACRO_CALL
    PATH
<...omitted...>
```

It should be:
```
SOURCE_FILE
  MACRO_CALL
    COMMENT
    WHITESPACE
    PATH
<...omitted...>
```


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

1 files changed, 5 insertions, 0 deletions

diff --git a/crates/ra_syntax/test_data/parser/ok/0053_outer_attribute_on_macro_rules.rs b/crates/ra_syntax/test_data/parser/ok/0053_outer_attribute_on_macro_rules.rs
new file mode 100644
index 000000000..b59c23c56
--- /dev/null
+++ b/crates/ra_syntax/test_data/parser/ok/0053_outer_attribute_on_macro_rules.rs
@@ -0,0 +1,5 @@
+/// Some docs
+#[macro_export]
+macro_rules! foo {
+    () => {};
+}