From dd97842964d7dae19aef1aff9d878686e2d46a83 Mon Sep 17 00:00:00 2001
From: Fabian Boehm <FHomborg@gmail.com>
Date: Tue, 23 Dec 2025 19:49:14 +0100
Subject: [PATCH] completions/rustc: Don't autoinstall nightly toolchain

Just calling `rustc +nightly` is enough to trigger automatic
installation.

Fixes #12202
---
 share/completions/rustc.fish | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/share/completions/rustc.fish b/share/completions/rustc.fish
index c14bbc89d..18045c529 100644
--- a/share/completions/rustc.fish
+++ b/share/completions/rustc.fish
@@ -34,6 +34,10 @@ function __fish_rustc_z_completions
         return
     end
 
+    if not command -q rustup; or not rustup toolchain list | string match -q 'nightly*'
+        return
+    end
+
     set -l rust_docs (rustc +nightly -Z help 2>/dev/null |
         string replace -r '^\s+' '' | string replace -ar ' +' ' ' | string replace -r '=val +-- +' '=\t')