From 11f3476c59ee013c017e669676cfaca00a67b3f1 Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume1.gomez@gmail.com>
Date: Tue, 6 Oct 2020 14:29:42 +0200
Subject: Enforce whitespace ascii character check for doc alias

---
 compiler/rustc_passes/src/check_attr.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'compiler/rustc_passes/src')

diff --git a/compiler/rustc_passes/src/check_attr.rs b/compiler/rustc_passes/src/check_attr.rs
index e8e54c3cfaa..1acaa4c6eff 100644
--- a/compiler/rustc_passes/src/check_attr.rs
+++ b/compiler/rustc_passes/src/check_attr.rs
@@ -303,6 +303,16 @@ impl CheckAttrVisitor<'tcx> {
                                 .emit();
                             return false;
                         }
+                        if doc_alias.starts_with(' ') || doc_alias.ends_with(' ') {
+                            self.tcx
+                                .sess
+                                .struct_span_err(
+                                    meta.span(),
+                                    "`#[doc(alias = \"...\")]` cannot start or end with ' '",
+                                )
+                                .emit();
+                            return false;
+                        }
                         if let Some(err) = match target {
                             Target::Impl => Some("implementation block"),
                             Target::ForeignMod => Some("extern block"),
-- 
cgit 1.4.1-3-g733a5