From a4e97f5a2b68939c503662369b1f02c478768e6d Mon Sep 17 00:00:00 2001
From: Florian Diebold <flodiebold@gmail.com>
Date: Sun, 6 Jan 2019 16:57:34 +0100
Subject: Show types when hovering patterns as well

---
 crates/ra_analysis/src/hover.rs | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

(limited to 'crates/ra_analysis')

diff --git a/crates/ra_analysis/src/hover.rs b/crates/ra_analysis/src/hover.rs
index 2cf79eebf..ba1fb9beb 100644
--- a/crates/ra_analysis/src/hover.rs
+++ b/crates/ra_analysis/src/hover.rs
@@ -3,7 +3,7 @@ use ra_editor::find_node_at_offset;
 use ra_syntax::{
     AstNode, SyntaxNode,
     ast::{self, NameOwner},
-    algo::{find_covering_node, visit::{visitor, Visitor}},
+    algo::{find_covering_node, find_leaf_at_offset, visit::{visitor, Visitor}},
 };
 
 use crate::{db::RootDatabase, RangeInfo, FilePosition, FileRange, NavigationTarget};
@@ -26,13 +26,17 @@ pub(crate) fn hover(
         }
     }
     if range.is_none() {
-        let expr: ast::Expr = ctry!(find_node_at_offset(file.syntax(), position.offset));
+        let node = find_leaf_at_offset(file.syntax(), position.offset).find_map(|leaf| {
+            leaf.ancestors()
+                .find(|n| ast::Expr::cast(*n).is_some() || ast::Pat::cast(*n).is_some())
+        });
+        let node = ctry!(node);
         let frange = FileRange {
             file_id: position.file_id,
-            range: expr.syntax().range(),
+            range: node.range(),
         };
         res.extend(type_of(db, frange)?);
-        range = Some(expr.syntax().range());
+        range = Some(node.range());
     };
 
     let range = ctry!(range);
@@ -192,6 +196,13 @@ mod tests {
         assert_eq!(hover.info, "i32");
     }
 
+    #[test]
+    fn hover_for_local_variable_pat() {
+        let (analysis, position) = single_file_with_position("fn func(fo<|>o: i32) {}");
+        let hover = analysis.hover(position).unwrap().unwrap();
+        assert_eq!(hover.info, "i32");
+    }
+
     #[test]
     fn test_type_of_for_function() {
         let (analysis, range) = single_file_with_range(
-- 
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