From 7101bada0f90eaf89718461affa583e1736f0099 Mon Sep 17 00:00:00 2001
From: oxalica <oxalicc@pm.me>
Date: Tue, 16 Mar 2021 00:58:29 +0800
Subject: Fix trait type parameter

---
 crates/hir/src/display.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'crates/hir')

diff --git a/crates/hir/src/display.rs b/crates/hir/src/display.rs
index 0640712de..e3660442c 100644
--- a/crates/hir/src/display.rs
+++ b/crates/hir/src/display.rs
@@ -233,7 +233,13 @@ impl HirDisplay for ConstParam {
 
 fn write_generic_params(def: GenericDefId, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
     let params = f.db.generic_params(def);
-    if params.lifetimes.is_empty() && params.types.is_empty() && params.consts.is_empty() {
+    if params.lifetimes.is_empty()
+        && params.consts.is_empty()
+        && params
+            .types
+            .iter()
+            .all(|(_, param)| !matches!(param.provenance, TypeParamProvenance::TypeParamList))
+    {
         return Ok(());
     }
     write!(f, "<")?;
-- 
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