1 files changed, 14 insertions, 0 deletions

diff --git a/crates/hir_def/src/item_tree/lower.rs b/crates/hir_def/src/item_tree/lower.rs
index 3328639cf..2ffa46ac0 100644
--- a/crates/hir_def/src/item_tree/lower.rs
+++ b/crates/hir_def/src/item_tree/lower.rs
@@ -283,6 +283,7 @@ impl Ctx {
         let name = func.name()?.as_name();
 
         let mut params = Vec::new();
+        let mut param_names = Vec::new();
         let mut has_self_param = false;
         if let Some(param_list) = func.param_list() {
             if let Some(self_param) = param_list.self_param() {
@@ -305,6 +306,18 @@ impl Ctx {
                 has_self_param = true;
             }
             for param in param_list.params() {
+                let param_name = param
+                    .pat()
+                    .map(|name| {
+                        if let ast::Pat::IdentPat(ident) = name {
+                            Some(ident.name()?.as_name())
+                        } else {
+                            None
+                        }
+                    })
+                    .flatten();
+                param_names.push(param_name);
+
                 let type_ref = TypeRef::from_ast_opt(&self.body_ctx, param.ty());
                 params.push(type_ref);
             }
@@ -341,6 +354,7 @@ impl Ctx {
             has_body,
             is_unsafe: func.unsafe_token().is_some(),
             params: params.into_boxed_slice(),
+            param_names: param_names.into_boxed_slice(),
             is_varargs,
             ret_type,
             ast_id,