From e2e34f6987d93ed5b80259c2af5a33c888180043 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9s=20Riedemann?=
 <38795484+longemen3000@users.noreply.github.com>
Date: Mon, 10 Jul 2023 10:21:37 -0400
Subject: [PATCH] correction in `Base.isassigned` with `Tridiagonal`
 boundscheck error (#50488)

See https://github.com/JuliaLang/julia/pull/49827#discussion_r1252566082
---
 stdlib/LinearAlgebra/src/tridiag.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdlib/LinearAlgebra/src/tridiag.jl b/stdlib/LinearAlgebra/src/tridiag.jl
index a53bb3815a481..70b39ef37e203 100644
--- a/stdlib/LinearAlgebra/src/tridiag.jl
+++ b/stdlib/LinearAlgebra/src/tridiag.jl
@@ -633,7 +633,7 @@ function diag(M::Tridiagonal{T}, n::Integer=0) where T
 end
 
 @inline function Base.isassigned(A::Tridiagonal, i::Int, j::Int)
-    @boundscheck checkbounds(A, i, j)
+    @boundscheck checkbounds(Bool, A, i, j) || return false
     if i == j
         return @inbounds isassigned(A.d, i)
     elseif i == j + 1