Merge #1277

1277: Improve macro item resolution r=matklad a=edwin0cheng

~This PR add a new namespace `Macros` in `per_ns.rs` to allow following use case:~
This PR improve macro item resolution to allow following use case:

```rust
//- /main.rs     
use foo::bar;
bar!();

//- /lib.rs  (crate foo)
#[macro_export]
macro_rules! bar{
() => {
    struct Foo { field: u32 } 
}
```


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

1 files changed, 5 insertions, 1 deletions

diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index 49030ce67..a9ffc8782 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -13,7 +13,7 @@ use crate::{
     adt::{EnumVariantId, StructFieldId, VariantDef},
     generics::HasGenericParams,
     docs::{Documentation, Docs, docs_from_ast},
-    ids::{FunctionId, StructId, EnumId, AstItemDef, ConstId, StaticId, TraitId, TypeAliasId},
+    ids::{FunctionId, StructId, EnumId, AstItemDef, ConstId, StaticId, TraitId, TypeAliasId, MacroDefId},
     impl_block::ImplBlock,
     resolve::Resolver,
     diagnostics::{DiagnosticSink},
@@ -937,6 +937,10 @@ impl Docs for TypeAlias {
         docs_from_ast(&*self.source(db).1)
     }
 }
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct MacroDef {
+    pub(crate) id: MacroDefId,
+}
 
 pub enum Container {
     Trait(Trait),