From 8c7fe68f3874a9c094617d56bcbbfac6434ea9e0 Mon Sep 17 00:00:00 2001
From: Jishnu Bhattacharya <jishnub.github@gmail.com>
Date: Thu, 13 Feb 2025 21:52:51 +0530
Subject: [PATCH 1/2] Detailed `showerror` for `SingularException`

---
 src/exceptions.jl | 4 ++++
 test/dense.jl     | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/src/exceptions.jl b/src/exceptions.jl
index 7791b1dd..1dd2ca17 100644
--- a/src/exceptions.jl
+++ b/src/exceptions.jl
@@ -28,6 +28,10 @@ struct SingularException <: Exception
     info::BlasInt
 end
 
+function Base.showerror(io::IO, ex::SingularException)
+    print(io, "SingularException: matrix is singular; factorization failed. Zero eigenvalue found at index ", ex.info)
+end
+
 """
     PosDefException
 
diff --git a/test/dense.jl b/test/dense.jl
index 1f953ea9..88eccfa6 100644
--- a/test/dense.jl
+++ b/test/dense.jl
@@ -1366,4 +1366,9 @@ end
     @test !any(LinearAlgebra.getstructure(A))
 end
 
+@testset "SingularException show" begin
+    A = diagm(0=> [1, 0])
+    @test_throws "matrix is singular; factorization failed" inv(A)
+end
+
 end # module TestDense

From c550974dcd271ef01bba5f8fc1a6ddb01dc59856 Mon Sep 17 00:00:00 2001
From: Jishnu Bhattacharya <jishnub.github@gmail.com>
Date: Sat, 15 Feb 2025 08:57:05 +0530
Subject: [PATCH 2/2] change to pivot

Co-authored-by: Steven G. Johnson <stevenj@alum.mit.edu>
---
 src/exceptions.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/exceptions.jl b/src/exceptions.jl
index 1dd2ca17..c346ce08 100644
--- a/src/exceptions.jl
+++ b/src/exceptions.jl
@@ -29,7 +29,7 @@ struct SingularException <: Exception
 end
 
 function Base.showerror(io::IO, ex::SingularException)
-    print(io, "SingularException: matrix is singular; factorization failed. Zero eigenvalue found at index ", ex.info)
+    print(io, "SingularException: matrix is singular; factorization failed. Zero pivot found at index ", ex.info)
 end
 
 """