From 2e09714dfe06f6cd252d0708a04741a5c36168e4 Mon Sep 17 00:00:00 2001
From: hi-rustin <rustin.liu@gmail.com>
Date: Mon, 22 Mar 2021 15:17:01 +0800
Subject: bail out early for source code closures

add closure error
---
 crates/hir_ty/src/display.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/crates/hir_ty/src/display.rs b/crates/hir_ty/src/display.rs
index 3845009ae..981ba564d 100644
--- a/crates/hir_ty/src/display.rs
+++ b/crates/hir_ty/src/display.rs
@@ -190,6 +190,7 @@ impl DisplayTarget {
 pub enum DisplaySourceCodeError {
     PathNotFound,
     UnknownType,
+    Closure,
 }
 
 pub enum HirDisplayError {
@@ -539,6 +540,11 @@ impl HirDisplay for Ty {
                 }
             }
             TyKind::Closure(.., substs) => {
+                if f.display_target.is_source_code() {
+                    return Err(HirDisplayError::DisplaySourceCodeError(
+                        DisplaySourceCodeError::Closure,
+                    ));
+                }
                 let sig = substs[0].callable_sig(f.db);
                 if let Some(sig) = sig {
                     if sig.params().is_empty() {
-- 
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