From 19094abd41fe398c2ba1a3c4926ef50c04eebabb Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Sat, 11 Jan 2020 01:51:08 +0800
Subject: Proper handling local in hover

---
 crates/ra_ide/src/hover.rs | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

(limited to 'crates/ra_ide/src/hover.rs')

diff --git a/crates/ra_ide/src/hover.rs b/crates/ra_ide/src/hover.rs
index 35e39f965..5548681f1 100644
--- a/crates/ra_ide/src/hover.rs
+++ b/crates/ra_ide/src/hover.rs
@@ -128,7 +128,7 @@ fn hover_text_from_name_kind(db: &RootDatabase, name_kind: NameKind) -> Option<S
             hir::ModuleDef::TypeAlias(it) => from_def_source(db, it),
             hir::ModuleDef::BuiltinType(it) => Some(it.to_string()),
         },
-        Local(_) => None,
+        Local(it) => Some(rust_code_markup(it.ty(db).display_truncated(db, None).to_string())),
         TypeParam(_) | SelfType(_) => {
             // FIXME: Hover for generic param
             None
@@ -174,6 +174,8 @@ pub(crate) fn hover(db: &RootDatabase, position: FilePosition) -> Option<RangeIn
         .value
         .ancestors()
         .find(|n| ast::Expr::cast(n.clone()).is_some() || ast::Pat::cast(n.clone()).is_some())?;
+
+    // The following logic will not work if token is coming from a macro
     let frange = FileRange { file_id: position.file_id, range: node.text_range() };
     res.extend(type_of(db, frange).map(rust_code_markup));
     if res.is_empty() {
@@ -729,4 +731,20 @@ fn func(foo: i32) { if true { <|>foo; }; }
             &["fn foo()"],
         );
     }
+
+    #[test]
+    fn test_hover_through_expr_in_macro() {
+        check_hover_result(
+            "
+            //- /lib.rs
+            macro_rules! id {
+                ($($tt:tt)*) => { $($tt)* }
+            }
+            fn foo(bar:u32) {
+                let a = id!(ba<|>r);
+            }            
+            ",
+            &["u32"],
+        );
+    }
 }
-- 
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